scope:

EN 12881-1 describes four methods for measuring the propagationof a flame along a conveyor belt which has been exposed to arelatively high localized heat source such as a fire. The damagesuffered by the conveyor belt, as well as its tendency to supportcombustion, is measured by observing the extent to which the firespreads along the test piece. Method A uses a test piece 2 m inlength and consumes propane gas through the burner at the rate of(1,30 ? 0,05) kg per 10 min. Method B uses a test piece 2,5 m inlength and consumes propane gas through two burners mounted aboveand below the test piece trestle at the rate of (1,30 ? 0,05) kgper 10 min for each burner. Method C uses a test piece 1,5 m inlength and consumes propane gas through the burner at the rate of(565 ? 10) g per 50 min. Method D uses a test piece 1,2 m in lengthand consumes propane gas through the burner at the rate of 150 l/hr(D1) or 190 l/hr (D2).