1.1本试验方法包括测定预成型隔热材料暴露于均热时发生的线性收缩量和其他变化。本试验方法仅限于适用于热侧温度超过200°F（93°C）的预制高温隔热材料，但试验方法C210涵盖的隔热耐火砖除外。在低于200°F的温度下，湿度也可能导致材料的尺寸变化，应根据试验方法C548进行试验。 1.2以英寸-磅为单位的数值应视为标准值。括号中给出的值仅供参考。 1.3本标准无意解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。

1.1 This test method covers the determination of the amount of linear shrinkage and other changes that occur when a preformed thermal insulating material is exposed to soaking heat. This test method is limited to preformed high-temperature insulation that is applicable to hot-side temperatures in excess of 200°F (93°C), with the exception of insulating fire brick which is covered by Test Method C210. At temperatures below 200°F, where humidity may also contribute to dimensional changes in a material, it should be tested in accordance with Test Method C548. 1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are provided for information only. 1.3 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.