GB/T 45973-2025
Paints and varnishes—Scratch test using a spring-loaded pen

This standard provides a test method for evaluating the scratch resistance of coatings. It employs a handheld spring-loaded scratch tester, which can be performed using either a pointed stylus (Method A) or a disc stylus (Method B). Both methods are applicable to flat or curved surfaces, with Method A also suitable for specimens as small as 30 mm × 50 mm. The test can be used for a simple "pass/fail" assessment or for graded evaluations. The method is designed to overcome the repeatability issues associated with traditional pencil hardness tests, which arise from variations in pencil materials. By utilizing a standardized spring-loaded pen with precisely controlled pressure (typically equipped with a tungsten carbide tip), it delivers more stable and reliable results. This makes it particularly convenient for rapid on-site inspections or for testing finished products such as flooring and automotive interior components.

This summary is not the original standard text and is for reference only. For accurate information, please obtain it through official channels.
Status Active
CCS G50 ICS 87.040
Release Date 2025-08-01 00:00:00 Implementation Date 2026-02-01 00:00:00