Char ging of dust gr ain and scr eening in a plasma at cr yogenic gas temper atur es

Disclosed is a fire retardant asphalt composition. The composition comprises: (a) about 40-60% wt asphalt; (b) about 1-20% wt thermoplastic; (c) about 30-40% wt flame retarding agent; and (d) the flame retarding agent comprises: (i) about 65-80% weight monoammonium phosphate, (ii) about 5-15% weight ammonium sulfate; and (iii) about 1% weight silicone polymer. Variations of this composition have passed the UL 790 test for Class A flame retardant materials.