paintwork materials.
Methods for determination of adhesion

Instead of GOST 15140-69

This standard applies to paints and varnishes and establishes methods for determining the adhesion of paints and varnishes to metal surfaces: 1 - peeling method; 2 - method of lattice cuts; 3 - method of lattice cuts with reverse impact; 4 - method of parallel cuts.

This International Standard does not apply to paints with a layer thickness exceeding 200 µm, with regard to the methods of lattice notching, lattice notching with reverse impact and parallel notching.

1. Peel method

1.1a. Method Essence

The essence of the method is to determine adhesion by peeling off a flexible plate from a glass-reinforced coating and measuring the force required for this.

(Introduced additionally, Rev. N 1).

1.1. Equipment and materials

Breaking machine with a maximum load of at least 30 N (3 kgf), with a load measurement error of not more than 1%.

A device for maintaining a constant delamination angle (see drawing) is attached to the lower clamp of the tensile testing machine.

A device for measuring the thickness of coatings with an error of no more than 10% (micrometer, etc.).

Soft roll foil 0.05 mm thick for technical purposes in accordance with GOST 618-73, made of aluminum in accordance with GOST 4784-74, grades AD1 and AD0.

Roll foil for technical purposes in accordance with GOST 5638-75, 0.05 mm thick, made of copper in accordance with GOST 859-78 grades M0, M1, M2.

Glass fiber fabrics according to GOST 8481-75, 0.04-0.06 mm thick.

Metal ruler for cutting strips.

Razor blade or scissors.

Hair brush, flat, soft, not less than 10 mm wide, hair length not less than 15 mm.

Glass for photographic plates 9x12 according to normative and technical documentation.

Technical acetone according to GOST 2768-84.

1.2. Preparing for the test

The foil is pulled over a glass plate, leveled and degreased with a cotton swab dipped in acetone.

aluminum foil used for paints and varnishes cured at a temperature not exceeding 300°C, and copper foil for materials cured at a temperature not exceeding 180°C.

The coating material is applied in a thin layer on the foil by any method and dried. After that, a second layer is applied, on which fiberglass is immediately applied, degreased with acetone and dried, and pressed tightly against the foil. Then the paintwork material is applied with a brush to the fiberglass, completely wetting it, removing all bumps and bubbles. The sample is dried.

Viscosity, the number of layers applied to the fiberglass, and the drying mode are determined by the regulatory and technical documentation for the paintwork material.

The thickness of the coating with fiberglass after drying should be at least 70 microns.

The dried sample is removed from the glass plate and cut lengthwise into 8-10 strips of 10x60 mm each. The extreme strips are discarded, and on the rest, the foil is manually peeled off from the coating with fiberglass to a length slightly exceeding half overall length strips (approximately 35 mm), and bend the foil 180 °.

"Fig. Device for maintaining a constant delamination angle"

It is allowed to determine the adhesion of the coating without reinforcement with fiberglass with a large thickness and low elasticity of the coatings.

Before determining the adhesion, if the exposure time of the coating after drying is not specified in the regulatory and technical documentation for the tested materials, the samples of cold drying are kept at (20+-2)°С and relative humidity air (65 + -5)% for 48 hours, and samples of hot drying for at least 3 hours.

Before determining the adhesion, the coating thickness is measured on at least three areas of the surface of the test sample, while the difference in the coating thickness should not exceed 10%.

1.1, 1.2. (Changed edition, Rev. N 1, 2, 3)

1.3. Conducting a test

The test is carried out at a temperature of (20+-2)°C and relative air humidity (65+-5)%, unless otherwise specified in the regulatory and technical documentation for paintwork materials.

The strip obtained according to paragraph 1.2 is fixed on a tensile machine so that the folded edge of the foil is clamped in a fixed clamp, and the coating with fiberglass in a movable clamp. A part of the non-laminated sample must be pressed against the guide bar (see drawing).

The sample is delaminated at a moving clamp speed of 0.0010-0.0012 m/s (65-70 mm/min) and a delamination angle of 180°C.

(Changed edition, Rev. N 1, 3).

1.4. Results processing

Adhesion in N/m (gf/cm) is calculated as the arithmetic mean of eight or ten determinations, the allowable discrepancies between which should not exceed 10%.

1.5. (Deleted, Rev. N 2).

2. Method of lattice cuts

2.1a. Method Essence

The essence of the method lies in applying lattice cuts to the finished paintwork and visually assessing the state of the coating according to a four-point system.

2.1. Equipment and materials

Plates made of sheet steel grade 08 kp with a size of at least 60x150 mm and a thickness of (0.9 + -0.1) mm according to GOST 16523-89 or from other metals, if this is provided for in the regulatory and technical documentation for the paint and varnish material.

Cutting tool: razor blade in holder of any type; single- or multi-bladed knife with a sharpening angle of the cutting part of 20-30° and a blade edge with a thickness of 0.05-0.10 mm.

Notching device type AD-3 according to TU 6-23-9-89, including a notching template and a cutting tool.

Metal ruler or template with grooves spaced 1, 2 or 3 mm apart.

Hair brush, flat, soft, at least 10 mm wide; hair length not less than 15 mm.

A device for measuring the thickness of coatings with a measurement error of not more than 10%.

Loupe with 2.5-4 (x) magnification.

(Changed edition, Rev. N 2, 3).

2.2. Preparing for the test

2.2.1. Two samples are prepared for the test. Application plates paintwork material prepared according to GOST 8832-76. The type of metal of the tested plates, their surface treatment before applying the paint and varnish material, the viscosity of the tested paint and varnish material, the application method, the number of layers, the possibility of using the paint coating system, the drying mode and the film thickness are indicated in the regulatory and technical documentation for the tested paint and varnish material.

2.2.2. A paint and varnish material is applied to the prepared plates and, after drying, the coating thickness is determined at least on three areas of the surface of the test sample, while the difference in coating thickness along the length of the sample should not exceed 10%.

Adhesion is determined after exposure of the film according to clause 1.2.

2.2.3. Before testing, the razor blade is replaced with a new one, and the quality of the cutting edge of the knife is checked with a magnifying glass. In the presence of small notches and dullness, the knife is sharpened. In case of disagreement in the assessment of adhesion, the knife is sharpened, and the blade is replaced with a new one.

(Changed edition, Rev. N 3).

2.3. Conducting a test

2.3.1. Tests are carried out on two samples and at least on three areas of the surface of each sample under the conditions specified in clause 1.3, unless otherwise indicated in the regulatory and technical documentation for the tested paint and varnish material.

2.3.2. On each tested section of the sample surface at a distance of at least 10 mm from the edge, at least six parallel cuts to metal with a length of at least 20 mm at a distance of 1, 2 or 3 mm from each other. The cutting tool is held perpendicular to the sample surface. The cutting speed should be between 20 and 40 mm/s. Similarly, cuts are made in the perpendicular direction. As a result, a lattice of squares of the same size is formed on the coating.

The distance between adjacent gratings must be at least 20 mm.

The size of a single grid square should be specified in the regulatory and technical documentation for the tested paint and varnish material. In the absence of such indications, a grating with a unit square 1x1 mm in size is applied to coatings with a thickness of less than 60 microns, 2x2 mm to coatings with a thickness of 60 to 120 microns, and 3x3 mm to coatings with a thickness of 120 to 200 microns.

The control of cutting through the coating to the metal is carried out using a magnifying glass.

(Changed edition, Rev. N 3).

2.4. Results processing

After making cuts to remove loose pieces of the coating, a soft brush is applied along the surface of the grating in a diagonal direction five times in the forward and reverse directions.

Adhesion is evaluated in accordance with table. 1, using a magnifying glass if necessary.

"Table 1. Adhesion evaluation"

The translation of a four-point scale into a six-point scale for assessing adhesion by the method of lattice cuts is given in the appendix.

For the test result, take the value of adhesion in points corresponding to the majority of the matching values determined on all tested areas of the surface of the two samples; while the discrepancy between the values should not exceed 1 point.

If the difference in adhesion values exceeds 1 point, the test is repeated on the same number of samples and the rounded average value obtained from four samples is taken as the final result.

If the repeatability of the two values is equal, the adhesion is evaluated by the larger value.

(Changed edition, Rev. N 3).

2.5. (Deleted, Rev. N 2).

3. Method of lattice cuts with reverse impact

Interstate standard GOST 15167-93 "Sanitary ceramic products. General specifications"(adopted by the Interstate Scientific and Technical Commission for Standardization and Technical Regulation in Construction on November 10, 1993) (as amended on December 17, 1997)"

UDC 667.63:620.179.4:006.354 Group L19

PAINT MATERIALS

METHODS FOR DETERMINING ADHESION

GOST 15140-78

IPK STANDARDS PUBLISHING HOUSE

STATE STANDARD OF THE UNION OF THE SSR

PAINT MATERIALS

Methods for determining adhesion GOST

15140-78

paintwork materials.

Methods for determination of adhesion

Introduction date 01.01.79

This standard applies to paints and varnishes and establishes methods for determining the adhesion of paint and varnish coatings to metal surfaces: 1 - peeling method; 2 - method of lattice cuts; 3 - method of lattice cuts with reverse impact; 4 - method of parallel cuts.

1. PEEL METHOD

1.1a. Method Essence

The essence of the method is to determine adhesion by peeling off a flexible plate from a glass-reinforced coating and measuring the force required for this.

1.1. Equipment and materials

Breaking machine with a maximum load of at least 30 N (3 kgf), with a load measurement error of not more than 1%.

A device for maintaining a constant delamination angle (see drawing) is attached to the lower clamp of the tensile testing machine.

A device for measuring the thickness of coatings with an error of no more than 10% (micrometer, etc.).

Soft roll foil 0.05 mm thick for technical purposes in accordance with GOST 618-73, made of aluminum in accordance with GOST 4784-74, grades AD1 and AD0.

Roll foil for technical purposes in accordance with GOST 5638-75, 0.05 mm thick, made of copper in accordance with GOST 859-78 grades M0, M1, M2.

Glass fiber fabrics according to GOST 8481-75, 0.04-0.06 mm thick.

Metal ruler for cutting strips.

Razor blade or scissors.

Hair brush, flat, soft, not less than 10 mm wide, hair length not less than 15 mm.

Glass for photographic plates sizes 9x12 according to normative and technical documentation.

Technical acetone according to GOST 2768-84.

1.2. Preparing for the test

The foil is pulled over a glass plate, leveled and degreased with a cotton swab dipped in acetone.

Aluminum foil is used for paintwork materials cured at a temperature not exceeding 300 °C, and copper foil for materials cured at a temperature not exceeding 180 °C.

Viscosity, the number of layers applied to the fiberglass, and the drying mode are determined by the regulatory and technical documentation for the paintwork material.

The thickness of the coating with fiberglass after drying should be at least 70 microns.

The dried sample is removed from the glass plate and cut lengthwise into 8-10 strips of 10x60 mm each. The extreme strips are discarded, and on the rest, the foil is manually peeled off from the coating with fiberglass to a length slightly exceeding half the total length of the strip (about 35 mm), and the foil is folded back by 180 °C.

Device for maintaining a constant angle of delamination

1 - fixed clamp; 2 - foil; 3 - a film of varnish (enamel) reinforced with fiberglass; 4 - movable clamp; 5 - guide bar

It is allowed to determine the adhesion of the coating without reinforcement with fiberglass with a large thickness and low elasticity of the coatings.

Before determining the adhesion, if the exposure time of the coating after drying is not specified in the regulatory and technical documentation for the tested materials, the cold-dried samples are kept at (20 ± 2) ° C and relative air humidity (65 ± 5)% for 48 hours, and the samples hot drying for at least 3 hours.

Before determining the adhesion, the coating thickness is measured on at least three areas of the surface of the test specimen, while the discrepancy in the coating thickness should not exceed 10%.

1.1, 1.2. (Changed edition, Rev. No. 1, 2, 3)

1.3. Conducting a test

The test is carried out at a temperature of (20 ± 2) ° C and relative air humidity (65 ± 5)%, unless otherwise indicated in the regulatory and technical documentation for paintwork materials.

The sample is delaminated at a moving clamp speed of 0.0010-0.0012 m/s (65-70 mm/min) and a delamination angle of 180°C.

1.4. Results processing

Adhesion in N/m (gs/cm) is calculated as the arithmetic mean of eight or ten determinations, the allowable discrepancies between which should not exceed 10%.

1.5. (Deleted, Rev. No. 2).

2. METHOD OF LATTICE INCUT

2.1a. Method Essence

The essence of the method lies in applying to the finished paintwork lattice incisions and visual assessment coverage conditions on a four-point system.

2.1. Equipment and materials

Plates made of sheet steel grade 08 kp with a size of at least 60x150 mm and a thickness of (0.9 ± 0.1) mm in accordance with GOST 16523-89 or from other metals, if it is provided for in the regulatory and technical documentation for the paint and varnish material.

Cutting tool: razor blade in holder of any type; single or multi-blade knife with a sharpening angle of the cutting part of 20-30 ° and a blade edge with a thickness of 0.05-0.10 mm.

Notching device type AD-3 according to TU 6-23-9-89, including a notching template and a cutting tool.

Metal ruler or template with grooves spaced 1, 2 or 3 mm apart.

Hair brush, flat, soft, at least 10 mm wide; hair length not less than 15 mm.

A device for measuring the thickness of coatings with a measurement error of no more than 10%.

Loupe with 2.5-4 x magnification.

2.2. Preparing for the test

2.2.1. Two samples are prepared for the test. Plates for applying paintwork material are prepared according to GOST 8832-76. The type of metal of the tested plates, their surface treatment before applying the paint and varnish material, the viscosity of the tested paint and varnish material, the application method, the number of layers, the possibility of using the paint coating system, the drying mode and the film thickness are indicated in the regulatory and technical documentation for the tested paint and varnish material.

2.2.2. A paint and varnish material is applied to the prepared plates and, after drying, the coating thickness is determined at least on three areas of the surface of the test sample, while the difference in the coating thickness along the length of the sample should not exceed 10%.

Adhesion is determined after exposure of the film according to clause 1.2.

(Revised edition, Rev. No. 3).

2.3. Conducting a test

The distance between adjacent gratings must be at least 20 mm.

The size of a single grid square should be specified in the regulatory and technical documentation for the tested paint and varnish material. In the absence of such indications, a grating with a unit square of 1x1 mm is applied to coatings with a thickness of less than 60 microns, 2x2 mm to coatings with a thickness of 60 to 120 microns, and 3x3 mm to coatings with a thickness of 120 to 200 microns.

The control of cutting through the coating to the metal is carried out using a magnifying glass.

(Revised edition, Rev. No. 3).

2.4. Results processing

After making cuts to remove loose pieces of the coating, a soft brush is applied along the surface of the grating in a diagonal direction five times in the forward and reverse direction.

Adhesion is evaluated in accordance with table. 1, using a magnifying glass if necessary.

Table 1

	Description of the paintwork surface after grating notches	Appearance coatings
	Notch edges are completely smooth, no signs of flaking in any grid square
	Slight peeling of the coating in the form of small scales at the intersection of the grating lines. Violation is observed on no more than 5% of the lattice surface
	Partial or complete peeling of the coating along the grating notch lines or at their intersections. Violation is observed not less than 5% and not more than 35% of the lattice surface
	Complete peeling of the coating or partial peeling, exceeding 35% of the grating surface

The translation of a four-point scale into a six-point scale for assessing adhesion by the method of lattice cuts is given in the appendix.

If the difference in adhesion values exceeds 1 point, the test is repeated on the same number of samples and the rounded average value obtained from four samples is taken as the final result.

If the repeatability of the two values is equal, the adhesion is evaluated by the larger value.

(Revised edition, Rev. No. 3).

2.5. (Deleted, Rev. No. 2).

3. METHOD OF LATTICE INCUT WITH REVERSE IMPACT

3.1a. Method Essence

The essence of the method consists in applying lattice cuts to the finished paint and varnish coating and visually assessing the state of the coating lattice after impact on the reverse side of the plate at the place where the lattice is applied. The method is designed to determine the adhesion of highly elastic coatings.

(Introduced additionally, Rev. No. 1).

3.1. Equipment and materials

The device for determining the strength of the film upon impact - according to GOST 4765-73.

Devices and materials specified in clause 2.1.

(Changed edition, Rev. No. 2, 3).

3.2. Preparing for the test

The preparation of the plates and the application of the test materials on the prepared plates is carried out according to clause 2.2.

3.3. Conducting a test

Lattice cuts on the samples of the tested coatings are applied according to clause 2.3, after which the sample with the painting surface is placed on the anvil of the device so that the area with lattice incisions was located under the striker. Then produce a shock effect on the sample.

The test is carried out according to GOST 4765-73, Sec. 3 until a height is established at which the impact does not cause the grating to peel off. With a normalized indicator, the load is set to a predetermined height.

(Changed edition, Rev. No. 1, 2, 3).

3.4. Results processing

Adhesion is evaluated by the value of the impact strength in centimeters, which the coating withstands without peeling off the notched squares, which corresponds to a score of 1 according to the table. one.

The test result is evaluated according to GOST 4765-73, Sec. four.

(Revised edition, Rev. No. 2).

3.5. (Deleted, Rev. No. 2).

4. METHOD OF PARALLEL CUTTING

4.1a. Method Essence

The essence of the method lies in applying parallel cuts to the finished paintwork and visually assessing the state of the coating according to a three-point system.

(Introduced additionally, Rev. No. 1).

4.1. Equipment and materials

Adhesive tape based on polyethylene terephthalate.

Equipment and materials - according to clause 2.1.

4.2. Preparing for the test

The preparation of the plates and the application of the test paint and varnish material on the prepared plates is carried out according to clause 2.2.

4.3. Conducting a test

Adhesion using adhesive tape is determined on two parallel samples and at least three sites on each sample. On each section of the sample surface at a distance of at least 10 mm from the edge of the plate, at least five parallel cuts with a length of at least 20 mm are made to the metal at a distance of 1, 2 or 3 mm from each other using cutting tool according to clause 2.1.

A strip of adhesive tape measuring 10x100 mm is applied perpendicular to the incisions and pressed tightly, leaving one end of the strip unglued.

With a quick movement, the tape is torn off perpendicularly from the coating. Adhesion by the method of parallel cuts is evaluated on a three-point scale (Table 2).

table 2

	Description of the surface of the paintwork after cutting and removing the adhesive tape	Coating appearance
	Cut edges are smooth
	Insignificant peeling of the film along the width of the strip along the cuts (no more than 0.5 mm)
	Peeling of the coating in stripes

(Changed edition, Rev. No. 1, 3).

4.4. Results processing

Processing of results - according to clause 2.4.

4.5. (Deleted, Rev. No. 2).

APPENDIX

Reference

Table for converting a four-point scale to a six-point ISO 2409-72 scale for assessing adhesion by the lattice notch method, in points

Four-point scale	Six point scale

(Changed edition, Rev. No. 1)

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of Chemical Industry

DEVELOPERS

L. P. Lavrishchev, M. I. Karyakina, N. V. Mayorova. N. L. Maslennikova

2. APPROVED AND INTRODUCED BY Decree State Committee standards of the Council of Ministers of the USSR dated 18.05.78 No. 1336

3. Periodicity of inspection - 5 years

4. The international standard ISO 2409-72 has been introduced into the standard

5. REPLACE GOST 15140-69

6. REFERENCE REGULATIONS AND TECHNICAL DOCUMENTS

	Number of paragraph, subparagraph


GOST 2768-84
GOST 4765-73
GOST 4784-74
GOST 5638-75
GOST 8481-75
GOST 8832-76
GOST 16523-89

7. The validity period was removed by decision of the Interstate Council for Standardization, Metrology and Certification (IUS 5-6-93)

8. REPUBLICATION (December 1995) with Amendments No. 1, 2, 3 approved in November 1982, June 1986, October 1991 (IUS 2-82, 10-86, 1-92)

GOST 15140-78

Group L19

STATE STANDARD OF THE UNION OF THE SSR

PAINT MATERIALS

Methods for determining adhesion

paintwork materials.
Methods for determination of adhesion

OKSTU 2310

Introduction date 1979-01-01

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of Chemical Industry

DEVELOPERS

L.P. Lavrishchev, M.I. Karyakina, N.V. Mayorova, N.L. Maslennikova

2. APPROVED AND INTRODUCED BY Decree of the State Committee for Standards of the Council of Ministers of the USSR dated 18.05.78 N 1336

3. Periodicity of inspection - 5 years

4. The international standard ISO 2409-72 has been introduced into the standard

5. REPLACE GOST 15140-69

6. REFERENCE REGULATIONS AND TECHNICAL DOCUMENTS


	Number of paragraph, subparagraph

7. The validity period was removed by decision of the Interstate Council for Standardization, Metrology and Certification (IUS 5-6-93)

8. REPUBLICATION (December 1995) with Amendments No. 1, 2, 3 approved in November 1982, June 1986, October 1991 (IUS 2-82, 10-86, 1-92)

This standard applies to paints and varnishes and establishes methods for determining the adhesion of paint and varnish coatings to metal surfaces: 1 - peeling method; 2 - method of lattice cuts; 3 - method of lattice cuts with reverse impact; 4 - method of parallel cuts.

This International Standard does not apply to paints with a layer thickness exceeding 200 µm, with regard to the methods of lattice notching, lattice notching with reverse impact and parallel notching.

(Changed edition, Rev. N 3).

1. PEEL METHOD

1.1a. Method Essence

The essence of the method is to determine adhesion by peeling off a flexible plate from a glass-reinforced coating and measuring the force required for this.

1.1. Equipment and materials

Breaking machine with a maximum load of at least 30 N (3 kgf), with a load measurement error of not more than 1%.

A device for maintaining a constant delamination angle (see drawing) is attached to the lower clamp of the tensile testing machine.

A device for measuring the thickness of coatings with an error of no more than 10% (micrometer, etc.).

Soft roll foil 0.05 mm thick for technical purposes in accordance with GOST 618-73, made of aluminum in accordance with GOST 4784-74, grades AD1 and AD0.

Roll foil for technical purposes in accordance with GOST 5638-75, 0.05 mm thick, made of copper in accordance with GOST 859-78 grades M0, M1, M2.

Glass fiber fabrics according to GOST 8481-75, 0.04-0.06 mm thick.

Metal ruler for cutting strips.

Razor blade or scissors.

Hair brush, flat, soft, not less than 10 mm wide, hair length not less than 15 mm.

Glass for photographic plates sizes 9x12 according to normative and technical documentation.

Technical acetone according to GOST 2768-84.

1.2. Preparing for the test

The foil is pulled over a glass plate, leveled and degreased with a cotton swab dipped in acetone.

Aluminum foil is used for paintwork materials cured at a temperature not exceeding 300 °C, and copper foil for materials cured at a temperature not exceeding 180 °C.

The coating material is applied in a thin layer on the foil by any method and dried. After that, a second layer is applied, on which fiberglass is immediately applied, degreased with acetone and dried, and pressed tightly against the foil. Then the paintwork material is applied with a brush to the fiberglass, completely wetting it, removing all bumps and bubbles. The sample is dried.

Viscosity, the number of layers applied to the fiberglass, and the drying mode are determined by the regulatory and technical documentation for the paintwork material.

The thickness of the coating with fiberglass after drying should be at least 70 microns.

The dried sample is removed from the glass plate and cut lengthwise into 8-10 strips of 10x60 mm each. The extreme strips are discarded, and on the rest, the foil is manually peeled off from the coating with fiberglass to a length slightly exceeding half the total length of the strip (about 35 mm), and the foil is folded 180 °.

Crap.

Device for maintaining a constant angle of delamination

1 - fixed clamp; 2 - foil; 3 - lacquer (enamel) film reinforced with fiberglass; 4 - movable clamp; 5 - guide bar

It is allowed to determine the adhesion of the coating without reinforcement with fiberglass with a large thickness and low elasticity of the coatings.

Before the determination of adhesion, if the exposure time of the coating after drying is not specified in the regulatory and technical documentation for the tested materials, cold-dried samples are kept at (20 ± 2) ° C and relative air humidity (65 ± 5)% for 48 hours, and the samples hot drying for at least 3 hours.

Before determining the adhesion, the coating thickness is measured on at least three areas of the surface of the test sample, while the difference in the coating thickness should not exceed 10%.

1.1, 1.2. (Changed edition, Rev. No. 1, 2, 3)

1.3. Conducting a test

The test is carried out at a temperature of (20 ± 2) °C and relative air humidity (65 ± 5)%, unless otherwise indicated in the regulatory and technical documentation for paintwork materials.

The strip obtained according to paragraph 1.2 is fixed on a tensile machine so that the folded edge of the foil is clamped in a fixed clamp, and the coating with fiberglass in a movable clamp. A part of the non-laminated sample must be pressed against the guide bar (see drawing).

The sample is delaminated at a moving clamp speed of 0.0010-0.0012 m/s (65-70 mm/min) and a delamination angle of 180°C.

(Changed edition, Rev. No. 1, 3).

1.4. Results processing

Adhesion in N/m (gs/cm) is calculated as the arithmetic mean of eight or ten determinations, the allowable discrepancies between which should not exceed 10%.

1.5. (Deleted, Rev. No. 2).

2. METHOD OF LATTICE INCUT

2.1a. Method Essence

The essence of the method lies in applying lattice cuts to the finished paintwork and visually assessing the state of the coating according to a four-point system.

2.1. Equipment and materials

Plates made of sheet steel grade 08 kp with a size of at least 60x150 mm and a thickness of (0.9 ± 0.1) mm in accordance with GOST 16523-89 or from other metals, if it is provided for in the regulatory and technical documentation for the paint and varnish material.

Cutting tool: razor blade in holder of any type; single- or multi-bladed knife with a sharpening angle of the cutting part of 20-30° and a blade edge with a thickness of 0.05-0.10 mm.

Notching device type AD-3 according to TU 6-23-9-89, including a notching template and a cutting tool.

Metal ruler or template with grooves spaced 1, 2 or 3 mm apart.

Hair brush, flat, soft, at least 10 mm wide; hair length not less than 15 mm.

A device for measuring the thickness of coatings with a measurement error of no more than 10%.

Loupe with 2.5-4 magnification.

2.2. Preparing for the test

2.3. Conducting a test

2.3.2. On each tested section of the sample surface at a distance of at least 10 mm from the edge, at least six parallel cuts to the metal with a length of at least 20 mm at a distance of 1, 2 or 3 mm from each other are made with a cutting tool along a ruler or template or using the AD-3 device. friend. The cutting tool is held perpendicular to the sample surface. The cutting speed should be between 20 and 40 mm/s. Similarly, cuts are made in the perpendicular direction. As a result, a lattice of squares of the same size is formed on the coating.

The distance between adjacent gratings must be at least 20 mm.

The size of a single grid square should be specified in the regulatory and technical documentation for the tested paint and varnish material. In the absence of such indications, a grating with a unit square of 1x1 mm is applied to coatings with a thickness of less than 60 microns, 2x2 mm to coatings with a thickness of 60 to 120 microns, and 3x3 mm to coatings with a thickness of 120 to 200 microns.

The control of cutting through the coating to the metal is carried out using a magnifying glass.

(Revised edition, Rev. No. 3).

2.4. Results processing

After making cuts to remove loose pieces of the coating, a soft brush is applied along the surface of the grating in a diagonal direction five times in the forward and reverse direction.

Adhesion is evaluated in accordance with table. 1, using a magnifying glass if necessary.

Table 1


	Description of the paintwork surface after grating notches	Coating appearance
	Notch edges are completely smooth, no signs of flaking in any grid square
	Slight peeling of the coating in the form of small scales at the intersection of the grating lines. Violation is observed on no more than 5% of the lattice surface
	Partial or complete peeling of the coating along the grating notch lines or at their intersections. Violation is observed not less than 5% and not more than 35% of the lattice surface
	Complete peeling of the coating or partial peeling, exceeding 35% of the grating surface

The translation of a four-point scale into a six-point scale for assessing adhesion by the method of lattice cuts is given in the appendix.

For the test result, take the value of adhesion in points corresponding to the majority of the matching values determined on all tested areas of the surface of the two samples; while the discrepancy between the values should not exceed 1 point.

If the difference in adhesion values exceeds 1 point, the test is repeated on the same number of samples and the rounded average value obtained from four samples is taken as the final result.

If the repeatability of the two values is equal, the adhesion is evaluated by the larger value.

(Revised edition, Rev. No. 3).

2.5 (Deleted, Rev. No. 2).

3. METHOD OF LATTICE INCUT WITH REVERSE IMPACT

3.1a. Method Essence

The essence of the method consists in applying lattice cuts to the finished paint and varnish coating and visually assessing the state of the coating lattice after impact on the reverse side of the plate at the place where the lattice is applied. The method is designed to determine the adhesion of highly elastic coatings.

(Introduced additionally, Rev. No. 1).

3.1. Equipment and materials

A device for determining the strength of the film upon impact - according to GOST 4765-73.

Devices and materials specified in clause 2.1.

(Changed edition, Rev. No. 2, 3).

3.2. Preparing for the test

The preparation of the plates and the application of the test materials on the prepared plates is carried out according to clause 2.2.

3.3. Conducting a test

Lattice notches are applied to the samples of the coatings to be tested according to clause 2.3, after which the sample with the painted surface is placed on the anvil of the device so that the area with the lattice notches is located under the striker. Then produce a shock effect on the sample.

The test is carried out in accordance with GOST 4765-73, section 3, until the height is established at which the impact does not cause the grating to peel. With a normalized indicator, the load is set to a predetermined height.

(Changed edition, Rev. No. 1, 2, 3).

3.4. Results processing

Adhesion is evaluated by the value of the impact strength in centimeters, which the coating withstands without peeling off the notched squares, which corresponds to a score of 1 according to the table. one.

The test result is evaluated according to GOST 4765-73, sec. four.

(Revised edition, Rev. No. 2).

3.5. (Deleted, Rev. No. 2).

4. METHOD OF PARALLEL CUTTING

4.1a. Method Essence

The essence of the method lies in applying parallel cuts to the finished paintwork and visually assessing the state of the coating according to a three-point system.

(Introduced additionally, Rev. No. 1).

4.1. Equipment and materials

Adhesive tape based on polyethylene terephthalate.

Equipment and materials - according to clause 2.1.

4.2. Preparing for the test

The preparation of the plates and the application of the test paint and varnish material on the prepared plates is carried out according to clause 2.2.

4.3. Conducting a test

Adhesion using adhesive tape is determined on two parallel samples and at least three sites on each sample. On each section of the sample surface at a distance of at least 10 mm from the edge of the plate, at least five parallel cuts with a length of at least 20 mm are made to the metal at a distance of 1, 2 or 3 mm from each other using a cutting tool according to clause 2.1.

A strip of adhesive tape measuring 10x100 mm is applied perpendicular to the incisions and pressed tightly, leaving one end of the strip unglued.

With a quick movement, the tape is torn off perpendicularly from the coating. Adhesion by the method of parallel cuts evaluated on a three-point scale (table 2).

table 2


	Description of the surface of the paintwork after cutting and removing the adhesive tape	Coating appearance
	Cut edges are smooth
	Insignificant peeling of the film along the width of the strip along the cuts (no more than 0.5 mm)
	Peeling of the coating in stripes

(Changed edition. Rev. No. 1, 3).

4.4. Results processing

Processing of results - according to clause 2.4.

4.5. (Deleted, Rev. No. 2).

APPENDIX (reference). Table for converting a four-point scale to a six-point ISO 2409-72 scale for assessing adhesion by the lattice notch method, in points

APPENDIX
Reference

(Revised edition, Rev. No. 1).

The text of the document is verified by:
official publication
M.: IPK Standards Publishing House, 1996

PAINT MATERIALS

METHODS FOR DETERMINING ADHESION

GOST 15140-78

IPK STANDARDS PUBLISHING HOUSE

Moscow

STATE STANDARD OF THE UNION OF THE SSR

Introduction date 01.01.79

1. PEEL METHOD

1.1 a. Method Essence

The essence of the method is to determine adhesion by peeling off a flexible plate from a glass-reinforced coating and measuring the force required for this.

(Introducedadditionally, ch. No. 1 ).

1.1 . Equipment and materials

Breaking machine with a maximum load of at least 30 N (3 kgf), with a load measurement error of not more than 1%.

A device for maintaining a constant delamination angle (see drawing) is attached to the lower clamp of the tensile testing machine.

A device for measuring the thickness of coatings with an error of no more than 10% (micrometer, etc.).

Soft rolled foil 0.05 mm thick for technical purposes according to GOST 618-73, made of aluminum according to GOST 4784-74, grades AD1 and AD0.

Roll foil for technical purposes in accordance with GOST 5638-75, 0.05 mm thick, made of copper in accordance with GOST 859-78 grades M0, M1, M2.

glass fiber fabrics GOST 8481-75, thickness 0.04 - 0.06 mm.

Metal ruler for cutting strips.

Razor blade or scissors.

Hair brush, flat, soft, not less than 10 mm wide, hair length not less than 15 mm.

Glass for photographic plates size 9´ 12 according to normative and technical documentation.

Acetone technical GOST 2768-84.

1.2 . Preparing for the test

The foil is pulled over a glass plate, leveled and degreased with a cotton swab dipped in acetone.

Aluminum foil is used for paints and varnishes cured at a temperature not exceeding 300 ° C, and copper foil for materials cured at a temperature not exceeding 180 ° FROM.

Viscosity, the number of layers applied to the fiberglass, and the drying mode are determined by the regulatory and technical documentation for the paintwork material.

The thickness of the coating with fiberglass after drying should be at least 70 microns.

The dried sample is removed from the glass plate and cut lengthwise into 8 - 10 strips of size 10´ 60 mm each. The extreme strips are discarded, and on the rest, the foil is manually peeled off from the coating with fiberglass to a length slightly exceeding half the total length of the strip (approximately 35 mm), and the foil is folded 180 ° FROM.

Device for maintaining a constant angle of delamination

1 - fixed clamp; 2 - foil; 3 - a film of varnish (enamel) reinforced with fiberglass; 4 - movable clamp; 5 - guide bar

It is allowed to determine the adhesion of the coating without reinforcement with fiberglass with a large thickness and low elasticity of the coatings.

Before determining the adhesion, if the exposure time of the coating after drying is not specified in the regulatory and technical documentation for the tested materials, the samples of cold drying are kept at (20 ± 2) ° ± 5) % within 48 hours, and stoving samples for at least 3 hours.

Before determining the adhesion, the coating thickness is measured on at least three areas of the surface of the test specimen, while the discrepancy in the coating thickness should not exceed 10%.

1.1 , 1.2. (Changed edition, Rev. No. 1, 2, 3)

1.3 . Conducting a test

The test is carried out at a temperature (20 ± 2) ° C and relative air humidity (65 ± 5) %, if there are no other indications in the normative and technical documentation for paintwork materials.

The strip obtained according to p. A part of the non-laminated sample must be pressed against the guide bar (see drawing).

The sample is delaminated at a speed of movement of the movable clamp of 0.0010 - 0.0012 m / s (65 - 70 mm / min) and a delamination angle of 180 ° FROM.

(Changed edition, Rev. No. 1, 3).

1.4 . Results processing

Adhesion in N/m (gs/cm) is calculated as the arithmetic mean of eight or ten determinations, the allowable discrepancies between which should not exceed 10%.

1.5 . (Deleted, Rev. No. 2).

2. METHOD OF LATTICE INCUT

2.1 a. Method Essence

The essence of the method lies in applying lattice cuts to the finished paintwork and visual assessment of the state of the coating according to a four-point system.

2.1 . Equipment and materials

Plates made of sheet steel grade 08kp with a size of at least 60´ 150 mm and thickness (0.9 ± 0.1) mm according to GOST 16523-89 or from other metals, if it is provided for in the regulatory and technical documentation for the paintwork material.

Cutting tool: razor blade in holder of any type; single or multi-blade knife with a sharpening angle of the cutting part 20 - 30 ° and a blade edge with a thickness of 0.05 - 0.10 mm.

Notching device type AD-3 according to TU 6-23-9-89, including a notching template and a cutting tool.

Metal ruler or template with grooves spaced 1, 2 or 3 mm apart.

Hair brush, flat, soft, at least 10 mm wide; hair length not less than 15 mm.

A device for measuring the thickness of coatings with a measurement error of no more than 10%.

Loupe with 2.5 - 4 x magnification.

2.2 . Preparing for the test

2.2.1 . Two samples are prepared for the test. Plates for applying paint and varnish material are prepared according toGOST 8832-76 . The type of metal of the tested plates, their surface treatment before applying the paint and varnish material, the viscosity of the tested paint and varnish material, the application method, the number of layers, the possibility of using the paint coating system, the drying mode and the film thickness are indicated in the regulatory and technical documentation for the tested paint and varnish material.

2.2.2 . A paint and varnish material is applied to the prepared plates and, after drying, the coating thickness is determined at least on three areas of the surface of the test sample, while the difference in the coating thickness along the length of the sample should not exceed 10%.

Adhesion is determined after exposure of the film according to p.

2.2.3 . Before testing, the razor blade is replaced with a new one, and the quality of the cutting edge of the knife is checked with a magnifying glass. In the presence of small notches and dullness, the knife is sharpened. In case of disagreement in the assessment of adhesion, the knife is sharpened, and the blade is replaced with a new one.

(Revised edition, Rev. No. 3).

2.3 . Conducting a test

2.3.1 . Tests are carried out on two samples and at least on three surface areas of each sample under the conditions specified in paragraph 1. , if there are no other indications in the normative and technical documentation for the tested paint and varnish material.

The distance between adjacent gratings must be at least 20 mm.

The size of a single grid square should be specified in the regulatory and technical documentation for the tested paint and varnish material. In the absence of such indications, a grating with a unit square of size 1 is applied to coatings with a thickness of less than 60 microns.´ 1 mm, for coatings with a thickness of 60 to 120 microns - 2´ 2 mm, for coatings with a thickness of 120 to 200 microns - 3´ 3 mm.

The control of cutting through the coating to the metal is carried out using a magnifying glass.

(Revised edition, Rev. No. 3).

2.4 . Results processing

After making cuts to remove loose pieces of the coating, a soft brush is applied along the surface of the grating in a diagonal direction five times in the forward and reverse direction.

Adhesion is evaluated in accordance with table. using a magnifying glass if necessary.

Table 1

	Description of the paintwork surface after grating notches	Coating appearance
	Notch edges are completely smooth, no signs of flaking in any grid square
	Slight peeling of the coating in the form of small scales at the intersection of the grating lines. Violation is observed on no more than 5% of the lattice surface
	Partial or complete peeling of the coating along the grating notch lines or at their intersections. Violation is observed not less than 5% and not more than 35% of the lattice surface
	Complete peeling of the coating or partial peeling, exceeding 35% of the grating surface

The translation of a four-point scale into a six-point scale for assessing adhesion by the method of lattice cuts is given in the appendix.

If the difference in adhesion values exceeds 1 point, the test is repeated on the same number of samples and the rounded average value obtained from four samples is taken as the final result.

If the repeatability of the two values is equal, the adhesion is evaluated by the larger value.

(Revised edition, Rev. No. 3).

2.5 . (Deleted, Rev. No. 2).

3. METHOD OF LATTICE INCUT WITH REVERSE IMPACT

3.1 a. Method Essence

(Introducedadditionally, ch. No. 1 ).

3.1 . Equipment and materials

The device for determining the strength of the film at impact - by GOST 4765-73.

Devices and materials specified in paragraph.

(Changed edition, Rev. No. 2, 3).

3.2 . Preparing for the test

The preparation of the plates and the application of the test materials on the prepared plates are carried out according to p.

3.3 . Conducting a test

Lattice notches are applied to the samples of the coatings to be tested according to p., after which the sample with the painting surface is placed on the anvil of the device so that the area with the lattice notches is located under the striker. Then produce a shock effect on the sample.

The test is carried out according to GOST 4765-73, sec. 3 until a height is established at which the impact does not cause the grating to peel off. With a normalized indicator, the load is set to a predetermined height.

(Changed edition, Rev. No. 1, 2, 3).

3.4 . Results processing

The test result is evaluated by GOST 4765-73, sec. four.

(Revised edition, Rev. No. 2).

3.5 . (Deleted, Rev. No. 2).

4. METHOD OF PARALLEL CUTTING

4.1 a. Method Essence

The essence of the method lies in applying parallel cuts to the finished paintwork and visually assessing the state of the coating according to a three-point system.

(Introducedadditionally, ch. No. 1 ).

4.1 .Equipment and materials

Adhesive tape based on polyethylene terephthalate.

Equipment and materials - according to p.

4.2 . Preparing for the test

The preparation of the plates and the application of the test paint and varnish material on the prepared plates is carried out according to p.

4.3 . Conducting a test

A strip of adhesive tape measuring 10 is applied perpendicular to the incisions.´ 100 mm and press it firmly, leaving one end of the strip unglued.

With a quick movement, the tape is torn off perpendicularly from the coating. Adhesion by the method of parallel cuts is evaluated on a three-point scale (Table ).

table 2