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

Delivery: 9 seconds. Download (and Email) true-PDF + Invoice.
Get Quotation: Click GB/T 30789.4-2015 (Self-service in 1-minute)
Newer / historical versions: GB/T 30789.4-2015

Preview True-PDF

Scope

This Part of GB/T 30789 describes a method for assessing the degree of
cracking of coatings by comparison with pictorial standards, using the
designation system defined in GB/T 30789.1.
ISO 4628-1 defines the system used for designating the quantity and size of
defects and the intensity of changes in appearance of coatings and outlines the
general principles of the system. This system is intended to be used, in
particular, for defects caused by ageing and weathering, and for uniform
changes such as colour changes, for example yellowing

Basic Data

Standard ID	GB/T 30789.4-2015 (GB/T30789.4-2015)
Description (Translated English)	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
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	G50
Classification of International Standard	87.040
Word Count Estimation	17,143
Date of Issue	2015-07-03
Date of Implementation	2016-02-01
Quoted Standard	ISO 4628-1
Adopted Standard	ISO 4628-4-2003, IDT
Regulation (derived from)	National Standard Announcement 2015 No.22
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary	This Standard specifies illustrated by comparison with the standard, used in the definition GB /T 30789.1 prescribed method to evaluate the level of cracking. ISO 4628-1 defines the coating defects caused by aging on the number and size of the uniformity of appearance change assessment system, assessment and overview of the General System. The system is particularly suitable for natural and artificial accelerated aging caused by exposure defects and uniform changes such as color changes, such as: yellowing.