ASTM E648-19ae1,Standard Test Method for Critical Radiant Flux of Floor-Covering Systems Using a Radiant Heat Energy Source.
ASTM E648-19ae1 covers a procedure for measuring the critical radiant flux of horizontally mounted floor-covering systems exposed to a flaming ignition source in a graded radiant heat energy environment in a test chamber.
Summary of Test Method
The basic elements of the test chamber are (1) an air-gas fueled radiant heat energy panel inclined at 30° to and directedat (2) a horizontally mounted floor covering system specimen Fig. 1. The radiant panel generates a radiant energy flux distribution ranging along the 100-cm length of the test specimen from a nominal maximum of 1.0 W/cm2 to a minimum of 0.1 W/cm2.The test is initiated by open-flame ignition from a pilot burner. The distance burned to flame-out is converted to watts per square centimeter from the flux profile graph, Fig. 2, and reported as critical radiant flux, W/cm2.