GB/T 30789.4-2015 《Paints and varnishes—Evaluation of degradation of coatings—Designation of quantity and size of defects ,and of intensity of uniform changes in appearance—Part 4: Assessment of degree of cracking》 Related products

The GB/T 30789.4-2015 standard provides a method for assessing the cracking grade of coatings. The cracking condition of coatings during aging is evaluated by comparing it with the standard diagram and applying the definition in GB/T 30789.1. This standard details the steps and criteria for assessing the degree of cracking, which is suitable for aging tests in artificial acceleration and natural environments. The evaluation process involves comparing the actual cracking condition of the coating with the standard diagram to determine the cracking grade. This standard ensures a systematic assessment of coating cracking problems.