Author : https://www.chinesestandard.net
Publisher : https://www.chinesestandard.net
ISBN 13 :
Total Pages : 12 pages
Book Rating : 4./5 ( download)
Book Synopsis GB/T 6742-2007 Translated English of Chinese Standard (GB/T 6742-2007, GBT6742-2007) by : https://www.chinesestandard.net
Download or read book GB/T 6742-2007 Translated English of Chinese Standard (GB/T 6742-2007, GBT6742-2007) written by https://www.chinesestandard.net and published by https://www.chinesestandard.net. This book was released on 2024-03-22 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
