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GOST 10760-76

INTERSTATE STANDARD

ELECTRICAL INSULATING LACQUER VL-941

TECHNICAL CONDITIONS

IPK PUBLISHING STANDARDS

Moscow

INTERSTATE STANDARD

* Reprinted (December 1998) with Amendment # 1, approved in November 1986.

(IUS 2-87)

By the decree of the State Committee of Standards of the Council of Ministers of the USSR dated January 9, 1976 No. 70, the date of introduction was established

01.01.77

The limitation of the period of validity was removed according to the protocol No. 4-93 of the Interstate Council for Standardization, Metrology and Certification (IUS 4-94)

This standard applies to VL-941 electrical insulating varnish, which is a solution of polyvinyl formaldehyde and phenol formaldehyde resins in a mixture of dicresol and solvent solvents.

Electrical insulating varnish VL-941 is intended for the manufacture of transposed wires in general paper insulation.

1. TECHNICAL REQUIREMENTS

1.1 ... Electrical insulating varnish VL-941 must be manufactured in accordance with the requirements of this standard according to the recipe and technological regulations, approved in the prescribed manner.

1.2 ... In terms of physical and chemical characteristics, the VL-941 electrical insulating varnish must comply with the requirements and standards specified in table. .

Table 1

Indicator name		Test methods
1. Appearance	Transparent viscous liquid from light yellow to dark Brown color free of gel particles	According to GOST 13526-79
2. The presence of mechanical impurities in the varnish	Absence	According to GOST 13526-79
3. The viscosity of the varnish at 20 ° C according to the VZ-1 viscometer (nozzle 5.4 mm), s		According to GOST 8420-74
4. Mass fraction of non-volatile substances,%, not less		According to GOST 17537-72 and p. of this standard
5. Mass fraction of ash,%, no more	0,03	According to p.
6. The appearance of the varnish film	The surface of the varnish film must be smooth, without roughness, from light brown to brown
7. Adhesion of lacquer film to copper	Withstands the test
8. Resistance of the varnish film to the action of solvents	Withstands the test

2. RULES OF ACCEPTANCE

2.1 ... Acceptance rules - by GOST 9980.1-86, section. 1.

2.2 ... The manufacturer checks the mass fraction of ash in the varnish periodically, but at least once a quarter.

3. TEST METHODS

3.1 ... Sampling - in accordance with GOST 9980.2-86, section. 2.

(Modified edition, Amendment No. 1).

3.2 . Sample preparation for testing

To check the quality of the varnish film by the appearance of the varnish film, the adhesion of the varnish film to copper, and the resistance of the film to the action of solvents, samples are prepared as follows.

Copper plate in accordance with GOST 434-78, size 100´ 10 mm and 0.1 mm thick, they are cleaned with abrasive paper in accordance with GOST 6456-82, degreased with benzene in accordance with GOST 5955-75 or toluene in accordance with GOST 5789-78 and covered with a preheated varnish. The varnish is heated in a water bath to 35 - 40 ° C, after which it is thoroughly mixed and allowed to stand for 5 - 10 minutes to remove air bubbles.

The prepared copper plate is covered with heated varnish, dipping it into varnish, followed by draining off the excess varnish for 5 minutes. Then the film applied to the plate is dried in a thermostat in an upright position at a temperature of (202 ± 2) ° C. To determine the appearance of the varnish film and the adhesion of the film, the plate is dried for 10 - 15 minutes, to determine the resistance of the film to the action of solvents - for 1 hour, after which the plate is cooled to ambient temperature. From the lower part of the plate, in the places where the varnish overflow is formed, a 5 mm plate is cut off.

3.3 ... The mass fraction of non-volatile substances is determined by GOST 17537-72 under an infrared lamp at (170 ± 3) ° C for 15 min.

To determine, take a sample of varnish of about 1 g, weighed with an error of not more than 0.0002 g, place it in an aluminum cup, evenly distributing it over a circle with a diameter of 40-50 mm.

Allowable discrepancies between parallel definitions should not exceed 0.4%.

3.4 . Determination of the mass fraction of ash

3.4.1 . Applied reagents and dishes:

technical calcium chloride in accordance with GOST 4568-95;

laboratory crucibles in accordance with GOST 9147-80.

3.4.2 . Testing

8 , 00 g of varnish is weighed in a crucible that has been calcined and weighed to the fourth decimal place.

The contents of the crucible are burned on an electric stove at low boiling of the liquid and the residue is calcined in a muffle furnace at 800 - 850° From to constant mass.

3.4.3 . Processing of results

Mass fraction of ash ( NS) as a percentage is calculated by the formula

where T - weight of varnish, g;

m 1 - ash mass after calcination, g.

Before each weighing with an accuracy of four decimal places, the crucible with ash is cooled in a desiccator over calcium chloride to ambient temperature.

The arithmetic mean of the results of two determinations is taken as the test result, the allowable discrepancy between which should not exceed 0.3% at a confidence level P = 0,95.

3.4.2 , 3.4.3. (Modified edition, Amendment No. 1).

3.5 ... The appearance of the varnish film is determined visually in natural diffused light without the use of magnifying devices.

3.6 ... The adhesion of the lacquer film to copper is determined on samples prepared in accordance with the requirements set out in cl. ... The sample is bent repeatedly 180 ° to the right and left for a sharp bend until the plate breaks. In the place of destruction of the plate, the varnish film should not peel off.

3.7 ... The resistance of the varnish film to the action of solvents is determined on samples prepared in accordance with the requirements specified in clause 5.2. .

In a test tube P1-21-200 XC in accordance with GOST 25336-82, half its height is poured into a mixture consisting of seven parts by volume of ethyl alcohol (GOST 17299-78, grade A) and three parts of toluene (GOST 5789-78). The tube is placed in a water bath with a temperature of 90 ° C and the mixture is heated to boiling. Place two samples in the boiling mixture and incubate them for 5 minutes. Then the solvent is drained, the plate is wiped with filter paper and examined.

The film should not have whitening and no bulging or swelling visible without the use of magnifying devices.

(Modified edition, Amendment No. 1).

4. PACKAGING, LABELING, TRANSPORTATION AND STORAGE

4.1 ... Packing of insulating varnish VL-941 - by GOST 9980.3-86.

4.2 ... Marking - in accordance with GOST 9980.4-86 and GOST 14192-96 with the application on the shipping container of the manipulation signs "Keep away from heating", "Sealed packaging" and the danger sign according to GOST 19433-88 , classification code 13310.

4.3 ... Transportation and storage of varnish - by GOST 9980.5-86.

4.4 ... The electrical insulating varnish is stored at temperatures from minus 15 to plus 25 ° C. Sec. . (Modified edition, Amendment No. 1).

5. MANUFACTURER'S WARRANTIES

5.1 ... The manufacturer guarantees the compliance of the varnish with the requirements of this standard, subject to the conditions of transportation and storage.

5.2 ... The guaranteed shelf life of the varnish is six months from the date of manufacture.

5.1 , 5.2. (Modified edition, Amendment No. 1).

6. SAFETY REQUIREMENTS

6.1 ... Electrical insulating varnish VL-941 is a toxic and fire hazardous product, which is due to the properties of its constituent polyvinyl formaldehyde, formaldehyde resins, phenol and solvents used in the test of varnish.

6.2 ... The characteristics of the fire hazard and toxicity of the components are given in table. .

table 2

Component name	Maximum permissible concentration in the air of the working area of ​​the industrial premises, mg / m 3	Temperature, ° С		Flammable concentration limits,% (by volume)	Hazard Class
		outbreaks	self-ignition
Benzene				1,4 - 7,1
Toluene				1,25 -6,5
Ethanol		13,0

All paints and varnishes with electrical insulating qualities can be divided into the following groups: impregnating, coating, gluing. For example, electrical insulating varnish ML 92, No. 318 and a number of others are used more as a protective impregnation. In addition, ML 92 and 318 are used to process the windings of electrical machines, apparatus, transformers, and individual electrical insulating parts.

The purpose

1. Impregnating. They are used as a connecting means of winding turns with each other, including to reduce porosity in winding insulation. The solution, penetrating into the pores, fills the space, thereby imparting moisture-repellent properties to the elements. The electrical insulating strength is increased, the electrical conductivity is improved.
2. Covering. They are used as an additional protective coating on already impregnated moisture-resistant or oil-resistant surfaces. Solutions of this nature are still used to insulate electrical steel sheets in magnetic circuits.
3. Adhesive. From the name of the group, the main purpose of the substances becomes clear - gluing together individual electrical insulating elements, for example, sheets of mica, ceramics, plastics, and so on. One of the important characteristics is the high adhesive properties of the mortar.

Despite such a strict differentiation into groups, almost all of these solutions can be used to perform two tasks at once, for example, impregnation and coating.

The classification of electrical insulating varnishes includes distribution not only by purpose, but also by other parameters:

• by the method of drying: cold (in natural conditions) and hot (under the influence of high temperatures- more than 100 degrees Celsius);
• on the basis: resin, oil, oil-bitumen, ether cellulose.

Characteristics of ML 92 varnish

ML 92 with electrical insulating properties is a mixture of glyphthal varnish with a mixture of melamine-formaldehyde resin, liquid in consistency. Organic solvents are used as diluents. The solution is usually sold ready-to-use. But to reduce the viscosity of the substance, dilution with toluene, xylene or a mixture of these substances with White spirit is allowed.

After polymerization, a shiny, uniform, brownish protective film is formed on the treated surface. The estimated consumption of the substance is 40-50 g per square meter. The polymerization time of one-layer varnishing is 60 minutes under high temperature conditions of + 105-110. With multi-layer impregnation under the same drying conditions (or 10 degrees higher), curing occurs in about 16 hours.

Important technical characteristics of ML 92 are indicators of dielectric strength and specific volumetric electrical resistance of the coating:

1. Electric strength, MV / m:

• at + 18-22 ° С - from 70;
• at + 128-132 ° С - from 40;
• after getting wet during the day at + 18-22 ° С - from 30;

1. Specific volumetric electrical resistance:

• at + 18-22 ° С - from 1.E + 12 Ohm. * m;
• at + 128-132 ° С - from 1.E + 9 Ohm. * m;
• after getting wet during the day at + 18-22 ° С - from 5.E + 10 Ohm. * m.

Due to the fact that volatile chemicals are present in the solution, you should adhere to the rules for working with the product and observe personal safety measures. Another precaution is basic fire safety rules.

Composition and technical characteristics of varnish 318

Oil-bitumen varnish 318 forms a protective black film on the surface. It is used for impregnation in the repair of low voltage electrical machines. Contains organic solvents. Diluted with white spirit and solvent naphtha.

Of the obvious advantages of the 318 oil-bitumen varnish with electrical insulating properties, the following should be highlighted:

• increased moisture resistance;
• heat resistance class A.

However, varnish 318 is weakly resistant to the influence of technical (transformer) oils and is capable of dissolving.

Insulating acrylic varnish

If you are looking for a high dielectric material, you can try acrylic insulating varnish. It is also used for corrosion and weather protection in motor and transformer windings and for printed circuit boards.

It dries pretty quickly. Forms a transparent protective film, sufficiently strong and resistant to various influences. Of the undoubted advantages of the solution, we highlight:

• moisture resistance;
• dirt resistance;
• protection against oxidative reactions;
• chemical inertness;
• high dielectric capacities;
• wide operating temperature range - from -70 ° С to + 100 ° С.

Electrical insulating varnishes and other similar means are needed in order to safely and efficiently use electrical equipment of various configurations.

Especially if such devices operate in automatic mode and perform important technological functions (in production, in everyday life).

Electrical insulating varnishML-92issued byGOST 15865-70

Purpose of electrical insulating varnishML-92

For impregnation of windings of electrical machines, apparatus and transformers and for coating electrical insulating parts.

Compositioninsulating varnishML-92

Lacquer ML-92 is a solution of a mixture of glyphtal lacquer and melamine-formaldehyde resin K-421-2 in organic solvents.

Properties of insulating varnishML-92

Lacquer ML-92, for its primary purpose, refers to materials that are exposed to electric voltages, currents, electric arcs and surface discharges and has a heat resistance class B in accordance with GOST 8865, which corresponds to a temperature of 130 ° C. Products coated with varnish can be operated under moderate conditions. and tropical climates both indoors and under a canopy or in premises (volumes), where fluctuations in temperature and humidity do not differ significantly from fluctuations in the open air and there is relatively free access to outside air. Temperature range of ML-92 varnish application is from minus 60 ° С to + 120 ° С.

Specifications electrical insulating varnish ML-92
Film appearance	glossy uniform smooth film from light brown to dark brown
Nominal viscosity according to the VZ-246 viscometer with a nozzle diameter of 4 mm at a temperature of (20.0 ± 0.5) ° C, s	25-50
Mass fraction of non-volatile substances,% C, s	50-55
Drying time to degree 3 at a temperature of (105 -110) ° C, h, no more	1
Film electrical strength, MV / m, not less at a temperature of (20 ± 2) ° C	70 40 30
Drying capacity of varnish in a thick layer at a temperature of (115-120) ° C, h, no more	16
Film hardness according to the pendulum device M-3, conv. units, not less	0,40
Specific volumetric electrical resistance of the film, Ohm x m, not less at a temperature of (20 ± 2) ° C at a temperature of (130 ± 2) ° C after exposure to water for 24 hours at a temperature of (20 ± 2) ° C	1∙10 12 1∙10 9 5∙10 10

Color solutionsvarnishML-92

After drying, ML-92 varnish forms a surface from light brown to dark brown.

StoragevarnishML-92

The guaranteed shelf life of the varnish is 12 months from the date of manufacture.

Lacquer ML-92 is stored in a tightly closed container, protected from moisture, heat and direct sunlight at temperatures from minus 40 o C to +40 o C.

Life timevarnishML-92

Subject to the requirements for surface preparation, application of materials and drying of coatings, it is allowed to apply ML-92 varnish on aluminum alloys without preliminary priming; operation of coatings in areas with temperate and tropical climates. This ensures the electrical insulating properties of the coating.

Packing

Electrical insulating varnish ML-92 is packaged in a special industrial container, taking into account all the requirements of the consumer.

Categories

ML-92, varnish, electrical insulation, aluminum, weather resistance, transformers, electrical machines

ApplicationvarnishML-92

Electrical insulating varnish ML-92 is impregnated with windings of electrical machines, apparatus and transformers, they are coated with electrical insulating parts, applying by dipping or pouring in 1-2 layers.

If necessary, ML-92 varnish is diluted with xylene, toluene or a mixture of one of these solvents with white spirit in a ratio of 3: 1. The thickness of a single-layer varnish coating is from 20 to 30 microns.

The first layer of varnish before re-dipping and the second layer of varnish before hot drying is kept at a temperature of (20 ± 2) ° С for 15 - 20 minutes. Then it is dried at a temperature of (105 - 110) ° С for 1 hour.

In a thick layer, the varnish dries at a temperature of 120 ° C for 16 hours.

Consumption for one-layer varnish coating from 40 to 48 g / m2.

Precautionary measures

When working with varnish ML-92, as well as after their completion, it is necessary to thoroughly ventilate the room. To protect hands, use rubber gloves... Keep away from fire!

The main advantages of electrical insulating varnishML-92

Lacquer ML-92 refers to materials that are exposed to electric voltages, currents, electric arcs and surface discharges;

Lacquer ML-92 has high electrical insulating properties;

Products treated with ML-92 varnish are used in different climatic zones, withstanding high temperature exposure (up to 130 ° C).

GOST 15865-70
Group L24

INTERSTATE STANDARD

ELECTRICAL INSULATING LACQUER ML-92
Technical conditions
Insulating varnish ML-92. Specifications

ISS 29.040.99
87.040
OKP 23 1131 1100 07

Date of introduction 1971-01-01

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the USSR Ministry of Chemical Industry

2. APPROVED AND INTRODUCED INTO EFFECT by the Resolution of the Committee of Standards, Measures and Measuring Instruments under the Council of Ministers of the USSR of 15.04.70 N 513
Amendment No. 5 was adopted by the Interstate Council for Standardization, Metrology and Certification (Protocol No. 20 dated 01.11.2001)
Registered by the Bureau of Standards IGU N 3992
Voted to accept the change:

State name	Name of the national authority on standardization
The Republic of Azerbaijan	Azgosstandart
Republic of Armenia	Armgosstandart
Republic of Belarus	State Standard of the Republic of Belarus
The Republic of Kazakhstan	Gosstandart of the Republic of Kazakhstan
Republic of Kyrgyzstan	Kyrgyzstandard
The Republic of Moldova	Moldovastandart
Russian Federation	Gosstandart of Russia
The Republic of Tajikistan	Tajikstandart
Turkmenistan	Glavgosluzhba "Turkmenstandartlary"
The Republic of Uzbekistan	Uzgosstandart
	State Standard of Ukraine

3. INTRODUCED FOR THE FIRST TIME

4. REFERENCE REGULATORY AND TECHNICAL DOCUMENTS

	Section, clause, subclause number
GOST 12.1.004-91
GOST 12.1.005-88
GOST 12.1.044-89
GOST 12.3.005-75
GOST 12.4.004-74
GOST 12.4.009-83
GOST 12.4.011-89
GOST 12.4.021-75
GOST 12.4.028-76
GOST 12.4.068-79
GOST 12.4.103-83
GOST 17.2.3.02-78
GOST 2768-84
GOST 3134-78
GOST 3722-81
GOST 5233-89	1.1, 2.13.1, 2.13.2.4
GOST 6433.1-71
GOST 6433.2-71
GOST 6433.3-71
GOST 6806-73
GOST 8420-74
GOST 8832-76
GOST 8865-93	Introductory part
GOST 8981-78
GOST 9410-78
GOST 9880-76
GOST 9949-76
GOST 9980.1-86
GOST 9980.2-86
GOST 9980.3-86
GOST 9980.4-2002
GOST 9980.5-86
GOST 10315-75
GOST 12026-76
GOST 13526-79	1.1, 2.10, 2.11, 2.12, 2.13.2.2, 2.14
GOST 14710-78
GOST 17269-71
GOST 17537-72
GOST 19007-73
GOST 19433-88

5. The limitation of the period of validity has been removed according to the protocol N 4-93 of the Interstate Council for Standardization, Metrology and Certification (IUS 4-94)
6. EDITION (March 2003) with Amendments No. 1, 2, 3, 4, 5, approved in October 1975, March 1980, June 1984, November 1988, May 2002 (IUS 12-75, 5-80, 10-84, 2-89, 8-2002)

This standard applies to electrical insulating varnish ML-92, which is a solution of a mixture of glyphtal varnish and melamine-formaldehyde resin K-421-02 in organic solvents.
Varnish ML-92 is intended for impregnation of windings of electrical machines, apparatus and transformers and for coating electrical insulating parts. Lacquer ML-92 has a heat resistance class B in accordance with GOST 8865.
Mandatory requirements aimed at ensuring the safety of ML-92 varnish for the life, health and property of citizens, environmental protection are set out in clause 1.1 (table 1, indicators 4, 12, 13), clauses 3.1, 3.2.
(Modified edition, Amendments N 4, 5).

1. TECHNICAL REQUIREMENTS

1. TECHNICAL REQUIREMENTS

1.1. In terms of physicochemical and electrical parameters, ML-92 varnish must comply with the requirements and standards specified in Table 1.

Table 1

Indicator name		Test Method
1. The presence of mechanical impurities in the varnish	Absence	According to GOST 13526
2. Appearance of the coating	After drying, the varnish should form a glossy, smooth, uniform surface of light brown to dark brown color.
3. Nominal viscosity according to a viscometer of the VZ-246 type with a nozzle diameter of 4 mm at a temperature of (20.0 ± 0.5) ° С, s		According to GOST 8420
4. Mass fraction of non-volatile substances in the varnish,%		According to GOST 17537 and clause 2.7 of this standard
5. Acid number, mg KOH, no more		According to GOST 13526
6. (Deleted, Amendment No. 4).
7. Drying time to degree 3 at a temperature of 105-110 ° C, h, no more		According to GOST 19007 and clause 2.10 of this standard
8. The ability of varnish drying in a thick layer at a temperature of 115-120 ° C, h, no more		According to GOST 13526 and clause 2.11 of this standard
9. Thermoelasticity of the film at a temperature of (150 ± 2) ° С, h, not less		According to GOST 13526 and clause 2.12 of this standard
10. Hardness of the coating according to the pendulum device at a temperature of (20 ± 2) ° С, not less:		According to GOST 5233 and clause 2.13.2.2 of this standard
type TML (pendulum A), relative units
or type M-3, conventional units
11. Oil resistance of the film, not less		According to GOST 13526 and clause 2.14 of this standard
12. Electric strength of the film, MV / m, not less:		According to GOST 6433.3, GOST 13526, GOST 6433.1, GOST 10315 and according to clause 2.15 of this standard
at a temperature of (20 ± 2) ° С
at a temperature of (130 ± 2) ° С
13. Specific volumetric electrical resistance of the film, Ohm · m, not less:		According to GOST 6433.2, GOST 13526, GOST 6433.1, GOST 10315 and clause 2.15 of this standard
at a temperature of (20 ± 2) ° С
at a temperature of (130 ± 2) ° С
after exposure to water for 24 hours at a temperature of (20 ± 2) ° С

1.2. Lacquer ML-92 must be produced in accordance with the requirements of this standard according to the recipe and technological regulations, approved in the prescribed manner.
(Modified edition, Amendment N 2).

1.3. (Deleted, Rev. N 2).

1.4. If necessary, before use, the varnish is diluted to the working viscosity with toluene (GOST 14710 or GOST 9880), xylene (GOST 9949 or GOST 9410) or a mixture of one of these solvents with white spirit (nefras-S4-155 / 200) (GOST 3134) in a ratio of at least 3: 1.

1.5, 1.6. (Excluded, Rev. N 2).

1a. Safety requirements

1a.1. Lacquer ML-92 is a fire hazardous and toxic material due to the properties of its components.
Maximum permissible concentrations, hazard classes of components in accordance with GOST 12.1.005 and fire hazard characteristics in accordance with GOST 12.1.044 are shown in Table 2.

table 2

Component name	Maximum permissible concentration of vapors in the air of the working area industrial premises, mg / m	Hazard Class	Temperature, ° С		Flammable concentration limits,% (by volume)
			outbreaks	self-igniting changes	lower	upper
Xylene			Not lower than 23	Above 450
Solvent
White Spirit			Not lower than 33
* Lower flammable limit at a temperature of 25 ° C and a pressure of 101325 Pa (760 mm Hg).

1a.2. Possible routes of admission harmful substances into the human body - inhalation and through the skin.
Vapors of solvents at high concentrations in the air irritate the mucous membranes of the eyes, upper respiratory tract and skin.

1a.3. The production of varnish must comply with the safety rules for paint and varnish industries, approved in the prescribed manner.

1a.4. Production, testing and use of varnish must comply with GOST 12.3.005 and GOST 12.1.004.

1a.5. Persons associated with the manufacture and use of varnish must be provided with special clothing in accordance with GOST 12.4.103 and personal protective equipment in accordance with GOST 12.4.011, GOST 12.4.068.
Personal respiratory protection against solvent vapors - in accordance with GOST 12.4.028, GOST 12.4.004 and GOST 17269.

1a.6. Work related to the manufacture and use of varnish is carried out in rooms equipped with supply and exhaust and local ventilation in accordance with GOST 12.4.021, which ensures the state of the air environment in accordance with GOST 12.1.005.
Fire extinguishing agents - sand, felt mat, foam fire extinguishers ОХП-10, carbon dioxide ОУ-2 and ОУ-5, water mist, foam installations - according to GOST 12.4.009.

1a.7. To protect the atmospheric air from pollution, air purification at gas cleaning plants and monitoring of compliance with maximum permissible emissions (MPE) in accordance with GOST 17.2.3.02 should be provided.

1a.8. Waste generated during equipment cleaning is disposed of in accordance with the procedure for accumulation, transportation, disposal and disposal of toxic industrial waste.

Section 1a.

1b. RULES OF ACCEPTANCE

1b.1. Acceptance rules - in accordance with GOST 9980.1.
(Modified edition, Rev. N 2, 4).

1b.2. Acceptance tests are carried out according to indicators 1-7, 10, 12, 13 of Table 1.
Upon receipt of unsatisfactory results of acceptance tests for at least one of the indicators, repeated tests are carried out on a doubled sample taken from the same batch.
The test results apply to the entire batch.

The norms for indicators 8, 9 of Table 1 are determined periodically in every tenth batch.
The norm for indicator 11 is determined at least once a year from the calendar date of the start of the varnish production.
If unsatisfactory results of periodic tests are obtained, check each batch until satisfactory results are obtained in a row for at least three batches.
If a repeated negative result is obtained, periodic tests are transferred to acceptance tests until satisfactory results are obtained.

(Modified edition, Amendment N 5).

1b.3. (Deleted, Amendment No. 5).

2. TEST METHODS

2.1, 2.2. (Excluded, Rev. N 2).

2.3. Sampling - in accordance with GOST 9980.2.

2.3a. Indicators - the appearance of the coating, the relative viscosity according to the viscometer of the VZ-246 (or VZ-4) type, the mass fraction of non-volatile substances, the acid number, the ability to dry in a thick layer - are determined in undiluted varnish.
(Modified edition, Amendments N 3, 4, 5).

2.4. (Deleted, Amendment No. 3).

2.5. The appearance of the varnish coating is determined visually under natural diffused light. The varnish is applied in bulk in one layer with an initial viscosity of 25-50 s on a clean glass plate measuring 90x120 mm, with a thickness of 1.2 to 1.8 mm. The plate is placed at an angle of 45 ° in a place protected from dust and kept at a temperature of (20 ± 2) ° C for 15-20 minutes, then dried at a temperature of 105-110 ° C for 1 hour. After cooling, examine the varnish coating.
(Modified edition, Amendment N 5).

2.6. (Deleted, Amendment No. 4).

2.7. To determine the mass fraction of non-volatile substances in the varnish, a sample of varnish weighing 1.5-2 g is placed in an oven and kept at a temperature of (120 ± 2) ° C for 1 hour.
(Modified edition, Amendment N 3).

2.8. (Deleted, Amendment No. 3).

2.9-2.9.2. (Excluded, Amendment N 4).

2.10. The drying time of the varnish film is determined in accordance with GOST 19007 on plates of soft copper tape 0.1 mm thick in accordance with regulatory documents. The varnish is applied in accordance with GOST 13526. The first layer of varnish before re-dipping and the second layer of varnish before hot drying is kept at (20 ± 2) ° C for 15-20 minutes. Then the plates with the applied varnish are dried at 105-110 ° C for 1 hour.
(Modified edition, Amendment N 5).

2.11. The drying capacity of varnish in a thick layer is determined according to GOST 13526 at a temperature of 115-120 ° C for 16 hours. Before hot drying the boxes with varnish are kept at (20 ± 2) ° C for 30 minutes. The state of the sample after heat treatment should correspond to S1 U-2-I (3-4) 2. Drying of the lower surface of the sample after its curing is checked as follows: on each sample, turned upside down, apply a sheet of filter paper (GOST 12026) with a square shape with a side of 24-25 mm, on top of which a rubber disk with a diameter of 22 mm and a thickness of 5 mm is placed, and then - a cylindrical load weighing 500 g. After 1 min, the sample is checked for compliance with the requirements of Table 3 of GOST 13526.
(Modified edition, Amendments N 3, 4, 5).

2.12. Thermoelasticity of the varnish film is determined in accordance with GOST 13526 on plates of soft copper tape 0.1 mm thick in accordance with regulatory documents. The varnish is applied and dried according to clause 2.10, while the second layer of varnish is dried at 115-120 ° C for 1 hour. Then the plates are kept in a thermostat at a temperature of (150 ± 2) ° C for 48 hours. The samples are removed from the thermostat, cooled to (20 ± 2) ° С and tested in accordance with GOST 6806 around a rod with a diameter of 3 mm.
(Modified edition, Amendments N 3, 5).

2.13. Determination of coating hardness

(Modified edition, Rev. N 3, 5)

2.13.1. The hardness of the varnish coating is determined in accordance with GOST 5233, Section 1.

2.13.2. Determination of coating hardness using a pendulum device of the M-3 type.

2.13.2.1. Apparatus and materials
Pendulum device type M-3 for determining hardness at room temperature (20 ± 2) ° С (drawing).

1 - trigger mechanism; 2 - base; 3 - scale; 4 - set screws; 5 - cargo; 6 - two-arrow mechanism; 7 - tripod; 8 - connecting strip; 9 - frame; 10 - a table; 11 - steel balls; 12 - plumb line

The main characteristics of the pendulum device:
- the mass of the pendulum (120 ± 1) g;
- the length of the pendulum, counting from the fulcrum to the end of the arrow, (500 ± 1) mm;
- diameter of the steel ball (fulcrum) 7.938 mm in accordance with GOST 3722;
- instrument scale divided by degrees;
- angle of deviation from 5 to 2 °;
- the decay time of oscillations on a glass plate ("glass number") (440 ± 6) s.
Glass plates measuring 90x120 mm, thickness from 1.2 to 1.8 mm.
Stopwatch.
Solvents: ethyl ether according to GOST 8981 or technical acetone according to GOST 2768.

2.13.2.2. Test preparation
Before each test, the support balls of the pendulum and the glass plate of the device are carefully wiped with cotton wool soaked in solvent and then with dry clean gauze.
On plates prepared in accordance with GOST 8832, the test varnish is applied in accordance with GOST 13526, kept at a temperature of (20 ± 2) ° C for 15-20 minutes and dried at a temperature of 115-120 ° C for 6 hours.

2.13.2.3. Testing
The pendulum device is checked by the "glass number" - the decay time of the oscillations of the pendulum, the support points of which lie on the glass plate of the device.
Determination of the "glass number" is carried out at a temperature of (20 ± 2) ° C and a relative humidity of (65 ± 5)%.
Measurements are carried out on at least three areas of the glass plate surface. In the same way, the decay time of the oscillations of the pendulum on a glass plate with a varnish coating is determined.

2.13.2.4. Processing of results
Hardness (), conventional units, is calculated by the formula

where is the decay time of the oscillations of the pendulum on the test lacquer coating, s;

Damping time of oscillations of the pendulum on the glass plate of the device ("glass number"), s.
For the test result, the arithmetic mean of the obtained results of measuring the damping time of oscillations of the pendulum on the glass plate of the device and on the test sample of the varnish coating is taken.
Deviations of the values ​​of single measurements from the arithmetic mean should not be more than 3%.
In case of disagreement, the "coating hardness" indicator is determined according to GOST 5233 using a pendulum device of the TML type (pendulum A).

2.13.2.5. Method error
The error of the method when determining the hardness on the M-3 device is ± 0.02 conventional units.

2.13.1-2.13.2.5. (Introduced additionally, Amendment No. 5).

2.14. The oil resistance of the varnish film is determined in accordance with GOST 13526 on plates of soft copper tape 0.1 mm thick in accordance with regulatory documents. The application of varnish and intermediate drying is carried out according to clause 2.10. Then the lacquered plates are dried at 115-120 ° C for 6 hours.
(Modified edition, Amendment N 5).

2.15. Electrical strength and specific volumetric electrical resistance are determined on plates of cold-rolled copper sheet (GOST 495 *) 100x100 mm in size, 0.4-0.6 mm thick. The varnish is applied and dried according to clause 2.14.
________________
* Within the territory of Russian Federation the document is not valid. GOST 1173-2006 is in effect. - Note from the manufacturer of the database.

The determination of the dielectric strength is carried out on two plates of volumetric electrical resistance for at least three samples.
The dielectric strength is determined using copper electrodes; the diameter of the upper electrode should be 25 mm. The use of stainless steel electrodes is allowed.
When determining the specific volumetric electrical resistance, the measuring and guard electrodes are used in the form of aluminum foil, ground to the surface of the sample.
The dielectric strength is measured with a smooth rise in voltage at such a rate that breakdown occurs in the range from 10 to 20 s after the start of the rise in voltage. When determining the specific volumetric electrical resistance, samples that have not been exposed to environments and elevated temperatures are tested at voltages of 100-500 V. After exposure to various media and at elevated temperatures, tests are carried out at voltages of 100-250 V.
Conditions for normalization, conditioning and testing of dielectric strength and specific volumetric electrical resistance:

1 h (20 ° C) 65%; M (15-35 ° C) 45-75%;

1 h (20 ° C) 65%; M (130 ° C)<20%;

1 h (20 ° C) 65% + 24 h [(23.0 ± 0.5) ° C] distilled water;
M (15-35 ° C) 45-75%.
(Modified edition, Amendments N 3, 4).

3. PACKAGING, LABELING, TRANSPORTATION AND STORAGE

3.1. Packing - in accordance with GOST 9980.3.
(Modified edition, Amendment N 4).

3.2. Marking - in accordance with GOST 9980.4.
The shipping container must bear a hazard sign according to GOST 19433 (class 3), classification code 3313, UN number 1263.

3.3. Transportation and storage of varnish - according to GOST 9980.5 *.
________________
* On the territory of the Russian Federation, GOST 9980.5-2009 is in force. - Note from the manufacturer of the database.

During storage, the relative viscosity of the varnish increases from the norm according to Table 1. When the varnish is diluted with a solvent to the norm in terms of the "viscosity" indicator, the varnish must comply with the requirements of this standard.

3.2, 3.3. (Modified edition, Amendments N 4, 5).

4. MANUFACTURER'S WARRANTIES

4.1. The manufacturer guarantees the compliance of the varnish with the requirements of this standard, subject to the storage and transportation conditions.

4.2. The guaranteed shelf life of the varnish is 12 months from the date of manufacture.

4.1, 4.2. (Modified edition, Amendment N 3).

APPENDIX (reference)

APPLICATION
Reference

Mass fraction of free formaldehyde in ML-92 varnish - no more than 0.6%.
APPLICATION. (Introduced additionally, Amendment N 4).

ROSSTANDART FA for Technical Regulation and Metrology
NEW NATIONAL STANDARDS: www.protect.gost.ru
FSUE STANDARTINFORM providing information from the database "Products of Russia": www.gostinfo.ru
FA FOR TECHNICAL REGULATION system "Dangerous goods": www.sinatra-gost.ru

GOST 15865-70

INTERSTATE STANDARD

ELECTRICAL INSULATING LACQUER ML-92

TECHNICAL CONDITIONS

IPK PUBLISHING STANDARDS

INTERSTATE STANDARD

Date of introduction 01.01.71

This standard applies to electrical insulating varnish ML-92, which is a solution of a mixture of glyphtal varnish and melamine-formaldehyde resin K-421-02 in organic solvents. Varnish ML-92 is intended for impregnation of windings of electrical machines, apparatus and transformers and for coating electrical insulating parts. The ML-92 varnish has a heat resistance class B in accordance with GOST 8865. The mandatory requirements aimed at ensuring the safety of ML-92 varnish for the life, health and property of citizens, and environmental protection are set out in paragraphs. 1.1 (table 1, indicators 4, 12, 13), 3.1, 3.2. (Modified edition, Amendments No. 4, 5).

1. TECHNICAL REQUIREMENTS

1.1. In terms of physicochemical and electrical characteristics, ML-92 varnish must comply with the requirements and standards specified in table. 1 .

Table 1

Indicator name		Test Method
1. The presence of mechanical impurities in the varnish	Absence	According to GOST 13526
2. Appearance of the coating	After drying, the varnish should form a glossy, smooth, uniform surface of light brown to dark brown color.	According to clause 2.5
3. Nominal viscosity according to a viscometer of the VZ-246 type with a nozzle diameter of 4 mm at a temperature of (20.0 ± 0.5) ° С, s		According to GOST 8420
4. Mass fraction of non-volatile substances in the varnish,%		According to GOST 17537 and clause 2.7 of this standard
5. Acid number, mg KOH, no more		According to GOST 13526
6. (Deleted, Amendment No. 4).
7. Drying time to degree 3 at a temperature of 105 - 110 ° С, h, no more		According to GOST 19007 and clause 2.10 of this standard
8. The ability of varnish drying in a thick layer at a temperature of 115 - 120 ° C, h, no more		According to GOST 13526 and clause 2.11 of this standard
9. Thermoelasticity of the film at a temperature of (150 ± 2) ° С, h, not less		According to GOST 13526 and clause 2.12 of this standard
10. Hardness of the coating according to the pendulum device at a temperature of (20 ± 2) ° С, not less:		According to GOST 5233 and clause 2.13.2.2 of this standard
type TML (pendulum A), relative units
or type M-3, conventional units		According to clause 2.13
11. Oil resistance of the film, H, not less		According to GOST 13526 and clause 2.14 of this standard
12. Electric strength of the film, MV / m, not less:		According to GOST 6433.3, GOST 13526, GOST 6433.1, GOST 10315 and according to clause 2.15 of this standard
at a temperature of (20 ± 2) ° С
after exposure to water for 24 hours at a temperature of (20 ± 2) ° С
13. Specific volumetric electrical resistance of the film, Ohm × m, not less:		According to GOST 6433.2, GOST 13526, GOST 6433.1, GOST 10315 and clause 2.15 of this standard
at a temperature of (20 ± 2) ° С
at a temperature of (130 ± 2) ° С
after exposure to water for 24 hours at a temperature of (20 ± 2) ° С

(Modified edition, Amendments No. 3, 4, 5). 1.2. Lacquer ML-92 must be produced in accordance with the requirements of this standard according to the recipe and technological regulations, approved in the prescribed manner. (Modified edition, Amendment No. 2). 1.3. (Deleted, Amendment No. 2). 1.4. If necessary, before use, the varnish is diluted to the working viscosity with toluene (GOST 14710 or GOST 9880), xylene (GOST 9949 or GOST 9410) or a mixture of one of these solvents with white spirit (nefras-S4-155 / 200) (GOST 3134) in a ratio of at least 3: 1. (Modified edition, Amendment No. 4). 1.5. 1.6. (Excluded, Amendment No. 2). 1a. Safety requirements 1a.1. Lacquer ML-92 is a fire hazardous and toxic material due to the properties of its components. Maximum permissible concentrations, hazard classes of components according to GOST 12.1.005 and fire hazard characteristics according to GOST 12.1.044 are given in table. 2.

table 2

Component name	Maximum permissible concentration of vapors in the air of the working area of ​​industrial premises, mg / m 3	Hazard Class	Temperature, ° С		Flammable concentration limits,% (by volume)
				self-ignition
Xylene			Not lower than 23
Solvent
White Spirit			Not lower than 33
Toluene

* Lower flammable limit at a temperature of 25 ° C and a pressure of 101325 Pa (760 mm Hg). 1a.2. Possible routes for the entry of harmful substances into the human body are inhalation and through the skin. Vapors of solvents at high concentrations in the air irritate the mucous membranes of the eyes, upper respiratory tract and skin. 1a.3. The production of varnish must comply with the safety rules for paint and varnish industries, approved in the prescribed manner. 1a.4. Production, testing and use of varnish must comply with GOST 12.3.005 and GOST 12.1.004. 1a.5. Persons associated with the manufacture and use of varnish must be provided with special clothing in accordance with GOST 12.4.103 and personal protective equipment in accordance with GOST 12.4.011, GOST 12.4.068. Individual respiratory protection from solvent vapors - in accordance with GOST 12.4.028, GOST 12.4.004 and GOST 17269. 1a.6. Work related to the manufacture and use of varnish is carried out in rooms equipped with supply and exhaust and local ventilation in accordance with GOST 12.4.021, which ensures the state of the air environment in accordance with GOST 12.1.005. Fire extinguishing agents - sand, felt mat, foam fire extinguishers ОХП-10, carbon dioxide ОУ-2 and ОУ-5, water mist, foam installations - according to GOST 12.4.009. 1a.7. To protect the atmospheric air from pollution, air purification at gas cleaning plants and monitoring of compliance with maximum permissible emissions (MPE) in accordance with GOST 17.2.3.02 should be provided. 1a.8. Waste generated during equipment cleaning is disposed of in accordance with the procedure for accumulation, transportation, disposal and disposal of toxic industrial waste. Sec. 1a. (Modified edition, Amendment No. 5).

1b. RULES OF ACCEPTANCE

1b.1. Acceptance rules - in accordance with GOST 9980.1. (Modified edition, Amendments No. 2, 4). 1b.2. Acceptance tests are carried out according to indicators 1 - 7, 10, 12, 13 table. 1. Upon receipt of unsatisfactory results of acceptance tests for at least one of the indicators, repeated tests are carried out on a doubled sample taken from the same batch. The test results apply to the entire batch. Norms for indicators 8, 9 tab. 1 is determined periodically in every tenth lot. The norm for indicator 11 is determined at least once a year from the calendar date of the start of the varnish production. If unsatisfactory results of periodic tests are obtained, check each batch until satisfactory results are obtained in a row for at least three batches. If a repeated negative result is obtained, periodic tests are transferred to acceptance tests until satisfactory results are obtained. (Modified edition, Amendment No. 5). 1b.3. (Deleted, Amendment No. 5).

2. TEST METHODS

2.1, 2.2. (Excluded, Amendment No. 2). 2.3. Sampling - in accordance with GOST 9980.2. (Modified edition, Amendments No. 3, 4). 2.3a. Indicators - the appearance of the coating, the relative viscosity according to the viscometer of the VZ-246 (or VZ-4) type, the mass fraction of non-volatile substances, the acid number, the ability to dry in a thick layer - are determined in undiluted varnish. (Modified edition, Amendments No. 3, 4, 5). 2.4. (Deleted, Amendment No. 3). 2.5. The appearance of the varnish coating is determined visually under natural diffused light. The varnish is applied in bulk in one layer with an initial viscosity of 25 - 50 s on a clean glass plate with a size of 90 ´ 120 mm and a thickness of 1.2 to 1.8 mm. The plate is placed at an angle of 45 ° in a place protected from dust and kept at a temperature of (20 ± 2) ° C for 15 - 20 minutes, then dried at a temperature of 105 - 110 ° C for 1 hour. After cooling, examine the varnish coating. (Modified edition, Amendment No. 5). 2.6. (Deleted, Amendment No. 4). 2.7. To determine the mass fraction of non-volatile substances in the varnish, a sample of varnish weighing 1.5 - 2 g is placed in an oven and kept at a temperature of (120 ± 2) ° C for 1 hour (Modified edition, Amendment No. 3). 2.8. (Deleted, Amendment No. 3). 2.9 - 2.9.2. (Excluded, Amendment No. 4). 2.10. The drying time of the varnish film is determined in accordance with GOST 19007 on plates of soft copper tape 0.1 mm thick in accordance with regulatory documents. The varnish is applied in accordance with GOST 13526. The first layer of varnish before re-dipping and the second layer of varnish before hot drying is kept at (20 ± 2) ° С for 15 - 20 minutes. Then the plates with the applied varnish are dried at 105 - 110 ° C for 1 hour (Changed edition, Amendment No. 5). 2.11. The drying capacity of varnish in a thick layer is determined according to GOST 13526 at a temperature of 115 - 120 ° C for 16 hours. Before hot drying the boxes with varnish are kept at (20 ± 2) ° C for 30 minutes. The state of the sample after heat treatment must correspond to SI U -2-1 (3-4) 2. The drying of the lower surface of the sample after its curing is checked as follows: on each sample, turned upside down, a sheet of filter paper (GOST 12026) of square shape with side 24 - 25 mm, on top of which a rubber disk with a diameter of 22 mm and a thickness of 5 mm is placed, and then a cylindrical load weighing 500 g. After 1 min, the sample is checked for compliance with the requirements of Table. 3 GOST 13526. (Modified edition, Amendments No. 3, 4, 5). 2.12. Thermoelasticity of the varnish film is determined in accordance with GOST 13526 on plates of soft copper tape 0.1 mm thick in accordance with regulatory documents. The varnish is applied and dried according to clause 2.10, while the second layer of varnish is dried at 115 - 120 ° C for 1 hour. Then the plates are kept in a thermostat at a temperature of (150 ± 2) ° C for 48 hours. The samples are removed from the thermostat, cooled to (20 ± 2) ° С and tested in accordance with GOST 6806 around a rod with a diameter of 3 mm. (Modified edition, Amendments No. 3, 5). 2.13. Determination of coating hardness (Changed edition, Amendment No. 5). 2.13.1. The hardness of the varnish coating is determined in accordance with GOST 5233, Sect. 1. 2.13.2. Determination of coating hardness using a pendulum device type M-3. 2.13.2.1. Apparatus and materials Pendulum device of the M-3 type for determining the hardness at room temperature (20 ± 2) ° С (drawing). The main characteristics of the pendulum device: - the mass of the pendulum (120 ± 1) g; - the length of the pendulum, counting from the fulcrum to the end of the arrow, (500 ± 1) mm; - diameter of the steel ball (fulcrum) 7.938 mm in accordance with GOST 3722; - instrument scale divided by degrees; - angle of deviation from 5 to 2 °; - the decay time of oscillations on a glass plate ("glass number") (440 ± 6) s. Glass plates measuring 90 ´ 120 mm, thickness from 1.2 to 1.8 mm. Stopwatch. Solvents: ethyl ether according to GOST 8981 or technical acetone according to GOST 2768. 1 - trigger mechanism; 2 - base; 3 - scale; 4 - set screws; 5 - cargo; 6 - two-arrow mechanism; 7 - tripod; 8 - connecting strip; 9 - frame; 10 - a table; 11 - steel balls; 12 - plumb bob 2.13.2.2. Preparation for the test Before each test, the pendulum support balls and the glass plate of the instrument are thoroughly wiped with cotton wool soaked in solvent and then with dry clean gauze. On plates prepared in accordance with GOST 8832, the test varnish is applied in accordance with GOST 13526, kept at a temperature of (20 ± 2) ° C for 15 - 20 minutes and dried at a temperature of 115 - 120 ° C for 6 hours. 2.13.2.3. Carrying out the test The pendulum device is checked by the "glass number" - the decay time of the oscillations of the pendulum, the support points of which lie on the glass plate of the device. Determination of the "glass number" is carried out at a temperature of (20 ± 2) ° C and a relative humidity of (65 ± 5)%. Measurements are carried out at least on three areas of the glass plate surface. In the same way, the decay time of the oscillations of the pendulum on a glass plate with a varnish coating is determined. 2.13.2.4. Expression of results Hardness (H), conventional units, calculated by the formula

Where t - damping time of oscillations of the pendulum on the test lacquer coating, s; t 1 is the decay time of the oscillations of the pendulum on the glass plate of the device ("glass number"), s. The arithmetic mean of the results of measuring the damping time of oscillations of the pendulum on the glass plate of the device and on the test sample of the varnish coating is taken as the test result. Deviations of the values ​​of single measurements from the arithmetic mean should not be more than 3%. In case of disagreement, the indicator "coating hardness" is determined according to GOST 5233 for a pendulum device of the TML type (pendulum A). 2.13.2.5. Method error The method error when determining the hardness on the M-3 device is ± 0.02 conventional units. 2.13.1 - 2.13.2.5. (Introduced additionally, Amendment No. 5). 2.14. The oil resistance of the varnish film is determined in accordance with GOST 13526 on plates of soft copper tape 0.1 mm thick in accordance with regulatory documents. Application of varnish and intermediate drying is carried out according to clause 2.10. Then the plates with the applied varnish are dried at 115 - 120 ° C for 6 hours (Modified edition, Amendment No. 5). 2.15. The electrical strength and specific volumetric electrical resistance are determined on plates of cold-rolled copper sheet (GOST 495) with a size of 100 ´ 100 mm and a thickness of 0.4 - 0.6 mm. The varnish is applied and dried according to clause 2.14. The determination of the dielectric strength is carried out on two plates of volumetric electrical resistance for at least three samples. The dielectric strength is determined using copper electrodes; the diameter of the upper electrode should be 25 mm. The use of stainless steel electrodes is allowed. When determining the specific volumetric electrical resistance, the measuring and guard electrodes are used in the form of aluminum foil, ground to the surface of the sample. The dielectric strength is measured with a smooth rise in voltage at such a rate that breakdown occurs in the range from 10 to 20 s after the start of the rise in voltage. When determining the specific volumetric electrical resistance, samples that have not been exposed to environments and elevated temperatures are tested at voltages of 100-500 V. After exposure to various environments and at elevated temperatures, tests are carried out at voltages of 100-250 V. Conditions for normalization, conditioning and dielectric strength tests and specific volumetric electrical resistance: 1 hour (20 ° C) 65%; M (15 - 35 ° C) 45 - 75%; 1 h (20 ° C) 65%; M (130 ° C)< 20 %; 1 ч (20 °С) 65 % + 24 ч [(23,0 ± 0,5) °С] дистиллированная вода; М (15-35°С) 45-75 %. (Измененная редакция, Изм. № 3, 4).

3. PACKAGING, LABELING, TRANSPORTATION AND STORAGE

3.1. Packing - in accordance with GOST 9980.3. (Modified edition, Amendment No. 4). 3.2. Marking - in accordance with GOST 9980.4. The shipping container must bear a hazard sign according to GOST 19433 (class 3), classification code 3313, UN number 1263. 3.3. Transportation and storage of varnish - according to GOST 9980.5. During storage, the relative viscosity of the varnish increases from the norm according to the table. 1. When the varnish is diluted with a solvent to the norm in terms of the "viscosity" indicator, the varnish must comply with the requirements of this standard. 3.2, 3.3. (Modified edition, Amendments No. 4, 5).

4. MANUFACTURER'S WARRANTIES

4.1. The manufacturer guarantees the compliance of the varnish with the requirements of this standard, subject to the storage and transportation conditions. 4.2. The guaranteed shelf life of the varnish is 12 months from the date of manufacture. 4.1, 4.2. (Modified edition, Amendment No. 3).

APPLICATION

Reference

Mass fraction of free formaldehyde in ML-92 varnish - no more than 0.6%. APPLICATION.(Introduced additionally, Amendment No. 4).

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the USSR Ministry of Chemical Industry 2. APPROVED AND INTRODUCED BY Decree of the Committee of Standards, Measures and Measuring Instruments under the Council of Ministers of the USSR No. 513 dated 04.15.70 Amendment No. 5 was adopted by the Interstate Council for Standardization, Metrology and Certification (Minutes No. 20 dated 01.11 .2001) Registered by the Bureau for Standards IGU No. 3992 Voted for adoption of the amendment:

State name	Name of the national standardization body
The Republic of Azerbaijan	Azgosstandart
Republic of Armenia	Armgosstandart
Republic of Belarus	State Standard of the Republic of Belarus
The Republic of Kazakhstan	Gosstandart of the Republic of Kazakhstan
Republic of Kyrgyzstan	Kyrgyzstandard
The Republic of Moldova	Moldovastandart
Russian Federation	Gosstandart of Russia
The Republic of Tajikistan	Tajikstandart
Turkmenistan	Glavgosluzhba "Turkmenstandartlary"
The Republic of Uzbekistan	Uzgosstandart
Ukraine	State Standard of Ukraine

3. INTRODUCED FOR THE FIRST TIME 4. REFERENCE REGULATORY AND TECHNICAL DOCUMENTS

			Section, clause, subclause number
GOST 12.1.004-91	1a.4	GOST 8420-74	1.1
GOST 12.1.005-88	la .l, la .6	GOST 8832-76	2.13.2.2
GOST 12.1.044-89	1a.1	GOST 8865-93	Introductory part
GOST 12.3.005-75	1a.4	GOST 8981-78	2.13.2.1
GOST 12.4.004-74	1a.5	GOST 9410-78	1.4
GOST 12.4.009-83	la .6	GOST 9880-76	1.4
GOST 12.4.011-89	1a.5	GOST 9949-76	1.4
GOST 12.4.021-75	la .6	GOST 9980.1-86	1b.1
GOST 12.4.028-76	1a.5	GOST 9980.2-86	2.3
GOST 12.4.068-79	1a.5	GOST 9980.3-86	3.1
GOST 12.4.103-83	1a.5	GOST 9980.4-2002	3.2
GOST 17.2.3.02-78	1a.7	GOST 9980.5-86	3.3
GOST 495-92	2.15	GOST 10315-75	1.1
GOST 2768-84	2.13.2.1	GOST 12026-76	2.11
GOST 3134-78	1.4	GOST 13526-79	1.1 , 2.10, 2.11, 2.12, 2.13.2.2, 2.14
GOST 3722-81	2.13.2.1	GOST 14710-78	1.4
GOST 5233-89	1.1 , 2.13.1, 2.13.2.4	GOST 17269-71	1a.5
GOST 6433.1-71	1.1	GOST 17537-72	1.1
GOST 6433.2-71	1.1	GOST 19007-73	1.1 , 2.10
GOST 6433.3-71	1.1	GOST 19433-88	3.2
GOST 6806-73	2.12

5. The limitation of the period of validity was removed according to the protocol No. 4-93 of the Interstate Council for Standardization, Metrology and Certification (IUS 4-94) 6. EDITION (March 2003) with Amendments No. 1, 2, 3, 4, 5, approved in October 1975, March 1980, June 1984, November 1988, May 2002 (IUS 12-75, 5-80, 10-84, 2-89, 8-2002)