BS 476-6 building material flame propagation index test

BS 476-6 building material flame propagation index test
BS 476-6 is mainly used to assess the fire performance of wall and ceiling linings, the test results to flame propagation index I said. BS 6853 reference the test standard to evaluate train the flame propagation properties.
 
 
Testing equipment: ignition source including 2 electric heater and a tubular burner, electric heater 45 mm from the sample of the vertically, power adjustable, burner in higher than 25 mm away from the bottom of the exposed surface sample on fire; Within the device with a chimney, chimney is equipped with thermocouple test flue gas temperature;
 
 
Sample request: 225 mm * 225 mm * actual thickness (less than or equal to 30 mm);
 
 
Testing process: the sample of the exposed to the heat release of 530 j/S of the tubular burner, the test after 165 S, opened the electric heater and adjust to 1800 w, 5 min after the power cut for 1500 w until the end of experiment, the total test time to 20 min;
 
 
Test results evaluation: thermocouples used continuous recording temperature and room temperature difference in the chimney, the temperature difference and the curve of time comparing with the calibration curve, the result, according to the formula to calculate the results sum, calculated total flame propagation index, I value the higher flame retardancy.