What is the standard for coating scratch test?

The standard of coating scratch test is usually determined according to the industry and application field involved, the following are some common standards and test methods:

ASTM D3363-05a Standard Test Method: This standard was developed by the American Society for Testing and Materials to evaluate the scratch hardness of organic coating materials. This method uses a set of hardness pencils to scratch the coating by applying pencils of different hardness, and then determines the hardness level of the coating according to the depth and coverage of the scratches.

GMW14872 Standard: This is a coating scratch test standard developed by General Motors to evaluate the scratch resistance of automotive coatings. The test method includes scratching the coating with pencils of different hardness and scratching tools, and determining the grade of the coating according to the depth and scope of the scratches.

The standard for scratch testing of coatings is ISO 1518. This global standard determines the resistance of paints, coatings, and varnishes by scratching with a needle. The ISO 1518 standard is used to determine the scratch resistance of samples with a conductive substrate. 

The ASTM D7027-13 standard test method is used to recognize surface damage on polymeric coatings or plastics. This method uses an automated scratch machine to conduct controlled scratch tests on polymeric specimens. 

The ASTM C1624 standard test method provides guidance and instructions on scratch adhesion testing of thin, hard ceramic coatings. This standard explains the principles of the scratch test in detail, including the limitations of the test. 

The ISO 4586 standard defines scratch resistance as the minimum load applied to a pricker of defined geometry that produces a continuous mark on the surface of the coating. 

Please note that the standards for coating scratch testing may vary by industry, application and region, so in actual applications, appropriate standards should be selected for testing based on specific circumstances. It is recommended to refer to relevant industry standards and customer requirements to determine the applicable coating scratch test standard.