1.1 本试验方法描述了一种确定金属基板上有机涂层（油漆）柔韧性和附着力的程序，当板材制成建筑面板或其他产品时，金属基板因弯曲而变形。 1.2 金属基底必须能够通过该测试而不会断裂，且不会出现过度的晶粒发育。 1.3 以英寸-磅单位表示的值应视为标准值。括号中给出的值是对SI单位的数学转换，仅供参考，不被视为标准值。 1.4 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 4.1 当通过滚压成型、制动弯曲或其他变形工艺制成产品时，预涂层板上的有机涂层会受到应力。这些应力可能超过涂层的柔韧性或粘合强度，导致涂层断裂，从而暴露基底，或导致涂层与基底的粘附力损失。该测试是评估涂层系统承受制造应力能力的一种方法。 4.2 弯曲方向、弯曲轴是否横向于或沿着金属的轧制方向以及弯曲时试样的温度会影响本试验的结果，供应商和用户应达成一致。

1.1 This test method describes a procedure for determining the flexibility and adhesion of organic coatings (paints) on metallic substrates that are deformed by bending when the sheet is fabricated into building panels or other products. 1.2 The metal substrate must be capable of passing this test without fracturing and with no excessive grain development. 1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 4.1 Organic coatings on precoated sheet are subjected to stresses when fabricated into products by roll forming, brake bending, or other deformation processes. These stresses can exceed the flexibility or adhesive strength of the coating, resulting in fracture of the coating which exposes the substrate, or in the loss of adhesion of the coating to the substrate. This test is a means of evaluating the ability of a coating system to withstand the stresses of fabrication. 4.2 The bend direction, whether the axis of bend is transverse to or along the rolling direction of the metal, and the temperature of the specimen when it is bent can affect the results of this test and should be agreed upon between the supplier and the user.