1.1 本规程涵盖了一个程序，用于通过评估密封剂相对于未暴露或未开裂版本的密封剂的实测压缩模量和拉伸模量之间的差异，定量确定密封剂样品中的开裂程度。裂缝将减少拉伸模量中密封剂的面积，但在压缩模量测量中，裂缝不会改变确定模量的面积。 1.2 SI单位的值应视为标准值。括号中的值仅供参考。 1.3 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。 1.4 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====== 5.1 本规程旨在定量测定密封剂相对于未暴露或未开裂样品的开裂量。在安装后的一段时间内，观察到一些密封剂样品出现了一定程度的开裂。裂缝程度以定性的方式进行目视评估，考虑密封剂暴露表面的裂缝面积，但不考虑裂缝的深度或轮廓。 密封剂的开裂程度已被用作性能变化的指示。

1.1 This practice covers a procedure for quantitatively determining the extent of cracking in a sealant sample by evaluating the difference between the measured compressive and tensile modulus of a sealant relative to an unexposed or uncracked version of the same sealant. The cracks will reduce the area of the sealant in the tensile modulus, but in the compressive modulus measurement they will not change the area over which the modulus is determined. 1.2 The values in SI units are to be regarded as standard. The values in parentheses are for information only. 1.3 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. 1.4 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 ====== 5.1 The intent of this practice is to quantitatively determine the amount of cracking of a sealant relative to an unexposed or uncracked sample. Some samples of sealant have been observed to exhibit some degree of cracking some period after installation. The degree of cracking is assessed visually in a qualitative manner that takes into account the area of the cracks at the exposed surface of the sealant, but does not take into account the depth or profile of the cracks. The degree of cracking in the sealant has been used as an indication of performance change.