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 (English Version)
General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
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GB/T 30789.4-2015
Scope
This part of GB/T 30789 gives the method for assessing the degree of cracking by comparison with the standard diagram, using the definition specified in GB/T 30789.1. ISO 4628-1 defines the evaluation system for the number and size of defects caused by coating aging and the degree of uniform change in appearance, and outlines the general principles of the evaluation system. The system is especially suitable for defects and uniform changes caused by artificial accelerated aging and natural exposure, such as color changes, eg yellowing.
GB/T 30789.4-2015 Referenced Document
ISO 4628-1 Paints and varnishes - Evaluation of degradation of coatings - Designation of quantity and size of defects, and of intensity of uniform changes in appearance - Part 1: General introduction and designation system*, 2016-01-01 Update
GB/T 30789.4-2015 history
2015GB/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