6Mil - 20'x100' String Reinforced Flame Retardant Polyethylene Sheeting/ Containment & Construction Film. Consists of two sheets of high strength flame retardant film laminated with a third layer of molten polyethylene. Reinforced with cross tied polyester tire cord. Durable, tear resistant, vapor barrier, ideal for containment. Indoor and outdoor uses include landscaping and vapor barriers for concrete. Ships 25 rolls/ pallet. Meets ASTM designation: D4397-91 and all associated specifications.