GB/T 6742-2007: Paints and varnishes -- Bend test (cylindrical mandrel)

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Scope

This standard specifies an empirical test method, for evaluating the resistance of
coatings of paints, varnishes or related products to cracking and/or peeling from metal
or plastic substrates, when bent about a cylindrical mandrel under standard conditions.
For multi-coat systems, each coating can be tested separately or the entire system can
be tested.
The test can be carried out in the following two ways:
- As a "pass/fail" test, i.e., using a mandrel of specified diameter to assess whether
the coating complies with specified requirements;
- Test the mandrels in sequence, to determine the maximum mandrel diameter at
which the coating will crack and/or peel off the substrate.
This standard specifies two types of instruments, Type I and Type II. Type I is suitable
for test panels which have a thickness not greater than 0.3 mm; type II is suitable for
test panels which have a thickness not greater than 1.0 mm. Both instruments give
similar results for the same coating; however, when testing a given product, it is
common to use only one instrument.

Basic Data

Standard ID	GB/T 6742-2007 (GB/T6742-2007)
Description (Translated English)	Paints and varnishes -- Bend test (cylindrical mandrel)
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	G50
Classification of International Standard	87.040
Word Count Estimation	9,972
Date of Issue	2007-09-11
Date of Implementation	2008-04-01
Older Standard (superseded by this standard)	GB/T 6742-1986
Quoted Standard	GB/T 3186-2006; GB/T 9271; GB 9278; GB/T 13452.2; GB/T 20777-2006
Adopted Standard	ISO 1519-2002, IDT
Regulation (derived from)	China Announcement of Newly Approved National Standards No. 10 of 2007 (No. 110 overall)
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 an assessment of paint, varnish or related products under standard conditions of the coating around the cylinder axis bending resistance to cracking and/or from a metal or plastic substrates peeling performance empirical test methods. For multi- coating system can be tested separately for each coating or test the entire system. Can be tested by the following two methods: as a " pass/fail " test, which uses a shaft diameter required test to assess coating meets specific requirements, followed by axis tests to determine the coating layer cracking and/or peeling from the substrate maximum shaft diameter. This standard provides for two types of instruments, l and type ��. I type for a thickness of not more than 0. 3 mm of test panels, �� type suitable for thickness less than 1. 0 mm of test panels. For the same coating, which gives similar results both instruments, but the test of a given product, it is usually only one instrument.