1.1 This test method covers a means of meausring the effect of radiant heat exposure at the standard levels of (a) 0.5 or (b) 2.0 cal/cm² -s (21 or 84 kW/m²) on a fabric specimen or a fabric assembly specimen.

1.2 The radiant protective performance (RPP) rating is calculated.

1.2..1 This value is not intended to be used as a performance specification.

1.2.2 The effects of the radiant energy exposure on the specimen may be observed and reported.

1.3 This test method is recommended for use with fabrics that are flame resistant and that are used in the manufacture of protective clothing.

1.4 This test method is not recommended for use with fabrics or with other textile materials that are not flame resistant, and that may not ignite and continue to burn from exposure to the radiant heat flux.

1.5 This test method measures and describes the response of materials, products, or assemblies to heat and flame under controlled conditions, but does not by itself incorporate all factors required for fire hazard or fire risk assessment of the materials, products, or assemblies under actual fire conditions.

1.6 The values stated in customary units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units.

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.