The ASTM D522-2021 standard describes an axial bending test method for evaluating the cracking resistance of organic coatings attached to sheet metal or rubber substrates. These test methods are suitable for evaluating the performance of coatings when the substrate is stretched, especially when the substrate size changes or the article is bent during use. In addition, this standard also mentions that the elongation of coatings can be evaluated by Miscellaneous test methods such as D2370. Users are required to ensure compliance with applicable safety, health and environment practices before use, taking into account the applicability of regulatory restrictions. ASTM D522-2021 was developed following the principles of international standards, providing a technical conformity basis for global trade.
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