1.1本规程涵盖了由垂直于热流方向放置的多个热辐射屏蔽形成的隔热材料的使用。这些辐射屏蔽由低发射率金属和绝缘层的交替层组成，结合起来可以避免金属与金属在热流方向上的接触，并将直接热传导降至最低。这些通常被业界称为多层绝缘（MLI）或超级绝缘（SI）。 1.2本规程涵盖了在温暖边界温度低于约450 K的情况下使用这些绝缘结构。 1.3当表观导热系数小于0.007 W/m时，使用该结构的隔热材料 · K[0.049 Btu · 在中/h · 英尺 2. · ° F] 需要300k。 1.4这种结构的绝缘材料用于真空环境。 1.5本规程涵盖了在低温环境中使用这些绝缘材料时的性能注意事项、典型应用、制造方法、材料规范和安全注意事项。 1.6以国际单位制或英寸-磅单位表示的数值应单独视为标准值。每个系统中规定的值可能不是精确的等效值；因此，每个系统应相互独立使用。将两个系统的值合并可能会导致不符合标准。 1.7 本标准并非旨在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。 具体安全隐患见第8节。

1.1 This practice covers the use of thermal insulations formed by a number of thermal radiation shields positioned perpendicular to the direction of heat flow. These radiation shields consist of alternate layers of a low-emittance metal and an insulating layer combined such that metal-to-metal contact in the heat flow direction is avoided and direct heat conduction is minimized. These are commonly referred to as multilayer insulations (MLI) or super insulations (SI) by the industry. 1.2 The practice covers the use of these insulation constructions where the warm boundary temperatures are below approximately 450 K. 1.3 Insulations of this construction are used when apparent thermal conductivity less than 0.007 W/m · K [0.049 Btu · in./h · ft 2 · ° F] at 300k are required. 1.4 Insulations of this construction are used in a vacuum environment. 1.5 This practice covers the performance considerations, typical applications, manufacturing methods, material specification, and safety considerations in the use of these insulations in cryogenic service. 1.6 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. 1.7 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 and health practices and determine the applicability of regulatory limitations prior to use. For specific safety hazards, see Section 8.