Fire endurance of mine stoppings
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      "A facility to evaluate the fire endurance of mine stoppings was constructed by the Bureau of Mines in the multiple-entry section of the Bruceton (Pennsylvania) Experimental Mine. Stoppings up to 6 by 8 ft can be tested in a manner simulating mine conditions. The stopping is subjected to a 70-min liquid fuel tray fire with an energy output of 75,000 Btu/min. The stopping and adjacent areas are instrumented with thermocouples and heat flux gauges. Data acquisition is by an automatic data logger capable of continuously recording over 100 channels of information. Two 8-in-thick concrete block stoppings and a galvanized steel stopping were tested. A crack developed on the fire-side surface of the block stoppings where the flames were most intense. However, the temperatures of the unexposed surfaces of the stoppings never exceeded 80 deg C and the surfaces were undamaged. The steel stopping retained its structural integrity during the test. The temperature of the unexposed steel surface reached 500 deg C, but combustible materials located 1 ft from the surface did not ignite. A 3/4-in-thick coating of construction plaster was applied to the fire side of the previously tested uncoated steel stopping. The quantity of heat energy transmitted across this coated metal stopping was reduced approximately 50 pct. All stoppings prevented the passage of flame and smoke." - NIOSHTIC-2 NIOSHTIC no. 10006287
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