ONORM B 3646 Teil.2-1986 Roll roofings and prefabricated sheets for waterproofing made of bitumen or modified bitumen; testing; appearance, mass per unit area, thickness, Saturation
1986ONORM B 3646 Teil.2-1986 Roll roofings and prefabricated sheets for waterproofing made of bitumen or modified bitumen; testing; appearance, mass per unit area, thickness, Saturation