GB/T 30789.1-2015: Paints and varnishes -- Evaluation of degradation of coatings -- Designation of quantity and size of defects, and of intensity of uniform changes in appearance -- Part 1: General introduction and designation system

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Scope

This Part of GB/T 30789 defines a system 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 used throughout GB/T 30789. 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.
The other parts of GB/T 30789 provide pictorial standards or other means of
evaluating particular types of defect. As far as possible, already existing
evaluation schemes have been used as the basis.
This Part of GB/T 30789 can also be used for assessing defects not covered
by the other parts of GB/T 30789.

Basic Data

Standard ID	GB/T 30789.1-2015 (GB/T30789.1-2015)
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 1: General introduction and designation system
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	G50
Classification of International Standard	87.040
Word Count Estimation	7,782
Date of Issue	2015-06-02
Date of Implementation	2016-01-01
Adopted Standard	ISO 4628-1-2003, IDT
Regulation (derived from)	National Standard Announcement 2015 No.19
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 the number and size of the evaluation of coating defects and the degree of uniform changes in appearance identification system, an overview of the General whole system, the system is particularly suitable for artificial aging and natural exposure caused by defects and uniform changes such as color changes, For example: yellowing. GB/T 30789 other part provides some standard picture or assessment of some special types of defects of other ways, as far as possible have been identified based on the method when assessing. Defects GB/T 30789 other parts are not included in this standard may also be assessed.