1.1 This practice covers standard mean temperatures for reporting thermal properties of thermal insulations, products, and materials, and of related systems and components, both insulated and uninsulated.

1.2 Thermal properties shall be determined as a function of temperature by standard test methods. (Test Methods C 177, C 201, C 236, C 335, C 518, C 745, C 976, C 1114, Guide C 653, and Practice C 687, all in combination with Practice C 1045.)

Note 1 - Standard referenced materials are needed to span the temperature range of the tests.

1.3 This practice recommends standard conditions for use in testing and evaluating thermal properties as a function of temperature by standard test methods.

1.4 General applications of thermal insulations include:

1.4.1 Building envelopes,

1.4.2 Mechanical systems or processes, and

1.4.3 Building and industrial insulations.

1.5 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. Approximate inch-pound units are provided in the tables.

1.6 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.