1.1 这种做法可用于评估预涂预应力金属板在沸水加速老化后对开裂和附着力损失的抵抗力，或两者兼而有之。大多数卷材涂层产品都是成型并弯曲成特定形状以生产最终产品。这些操作引入了应力，这些应力可以通过老化后涂层的破裂来减轻。 1.2 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制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.3 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 3.1 预涂金属作为涂漆线圈提供，并制成成品。制造过程会对涂料系统产生应力。为了确定这种应力是否会导致使用故障，通常将应力样品浸入沸水中。如果未发生故障（请参阅 7.4 )暴露在沸水中后，现场不太可能发生故障。

1.1 This practice can be used to evaluate the resistance of a pre-stressed prepainted metal panel to cracking and loss of adhesion, or both, after accelerated aging by boiling water. Most coil coated products are formed and bent into specific shapes to produce a final product. These operations introduce stresses, which may be relieved by cracking of the coating after aging. 1.2 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. 1.3 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 ====== 3.1 Prepainted metal is supplied as a painted coil, and it is fabricated into a finished part. The fabrication process induces stress to the paint system. To determine if this stress will lead to a failure in service, it is common to immerse the stressed sample in boiling water. If no failure occurs (see 7.4 ) after exposure to boiling water, it is very unlikely that a failure will occur in the field.