... petroleum asphalt, then covered with high-sof Asphalt roofing felt is processed by making the paper base soaked in ... talc power.This product is specialized in waterproof materials, packing, buliding damp proofing.Asphalt felt Roll Size 1x20m, 1mx16m, 1mx19m, ... .10MpaAsphalt felt Breaking Elongation: 240-370NWeight of per rool: 25lb, 30lb, 40lb, 45lb, 50lb, 55lb, 60lb, 70lb etc waterproof roofing felt