scope:

1. Scope

1.1 This test method is used to measure the arc thermal performance value of materials intended for use as flame resistant clothing for workers exposed to electric arcs that would generate heat flux rates from 2 to 600 cal/cm2s.

1.2 This test method will measure the arc thermal performance value of materials which meet the following requirements: less than 6 in. char length and less than 2 s afterflame when tested in accordance with Federal Test Method 191A Method 5903.1.

1.2.1 It is not the intent of this procedure to evaluate non flame resistant materials except where used as under layers in multiple layer specimens.

1.3 The materials used in this test method are in the form of flat specimens.

1.4 This test method may be used to generate information for the development of smaller scale test methods.

1.5 This standard shall be used to measure and describe the properties of materials, products, or assemblies in response to convective and radiant energy generated by an electric arc under controlled laboratory conditions.

1.6 The values stated in either SI units or in other units shall be regarded separately as standard. The values stated in each system may not be exact equivalents, therefore each system must be used independently of the other, without combining values in any way.

1.7 This standard shall not be used to describe or appraise the fire hazard or fire risk of materials, products, or assemblies under actual fire conditions. However, results of this test may be used as elements of a fire assessment which takes into account all of the factors which are pertinent to an assessment of the fire hazard of a particular end use.

1.8 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 precautions, see Section 7.