Poly Scrim 12mil is a fire retardant PVC liner. It is a 3 ply, 12 mil extrusion laminate mbining two layers of fire retardant PVC film and a high-strength rd grids. Strong yet light weight. A good solution for ntainment, tarps or vers. Passes NFPA 701 Large Scale-"Standard Methods of Fire Test for Flame-Resistant Textiles and Fil".