ASTM F1939
Standard Test Method for Radiant Heat Resistance of Flame Resistant Clothing Materials with Continuous Heating
This test method evaluates a material’s heat transfer properties when exposed to a continuous and constant radiant heat source. The specimen is maintained in a static, vertical position and it can be tested under two standard sets of exposure conditions: 21 kW/m2 [0.5 cal/cm2s] and 84 kW/m2 [2.0 cal/cm2s]. Either can be used. The test rates the non-steady state thermal resistance or insulating characteristics of flame resistant clothing materials subjected to a continuous, standardized radiant heat exposure.
