ISBN:  Unavailable

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Page count: 29

Certification tests for urethane-foam systems and techniques for applying foam safely in mines are described. Fire hazard from foam exists if flame propagates beyond the ignition source or penetrates the foam. Foam that passes the certification tests can be applied on stoppings, continuous sections of ribs, of relatively wide passageways (with no foam on the roof), short sections of roof such as overcasts, roof cavities, and intersections (with no foam n the ribs), and between buntons on one wall of a shaft. Foam on the ribs and adjoining roof presents a fire hazard. Stoppings covered with foam passing the certification tests are more resistant to penetration of heat, flame, and smoke than similar stoppings without foam. Flame propagation can be arrested by water sprays, Spontaneous ignition of foam can be prevented.