interactive communication agency avenue krieg custom essays (1 essays)

Polyurethane foam (`Rigiseal , manufactured by the Dow Chemical Company ) was used in underground mines throughout the USA . Its functions were to create a rigid , durable seal and to bind together elements of rock where there was a possibility that fracturing might take place . While there was general use of this material in America , following tests of its flammability in Great Britain in 1962 it had been banned from use underground In 1966 , the United States Bureau of Mines also tested...