GB/T 30789.4-2015 Active
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
Abstract
This part of GB/T 30789 provides a method for assessing the cracking grade by comparing with the standard illustrations and using the definitions specified in GB/T 30789.1.
ISO 4628-1 defines a system for assessing the number and size of defects caused by coating aging, as well as the degree of uniform change in appearance, and outlines the general principles of the assessment system. This system is particularly suitable for defects and uniform changes caused by artificial accelerated aging and natural exposure, such as color changes, for example: yellowing.
General Product Information
| Document Type | National standards |
|---|---|
| Standard Status | Active |
| Standard Code | GB/T 30789.4-2015 |
| CCS | Paints, pigments, and dyes |
| ICS | Paints and varnishes |
| Implement Date | 2016-02-01 |