4 Mil 20'x100' Flame Retardant Polyethylene Sheeting roll / Containment & Construction Film. Made from high strength fire retardant film laminated together with a third layer of molten polyethylene. Very durable, vapor barrier, ideal for containment and weather-proofing. Ships 35 rolls/ pallet. Meets ASTM designation: D4397-91 and all associated specifications. ** Additional Info / Questions / Help CALL 1.800.872.3684, Fax 610-436-4983, Email [email protected]