... glassfiber base 2.Surface material: PE film, sand,mineral,Alu roof felt App Usage range:Bridge building, storage, road, tunnel, parking ... , swimming pool, water-disposal pool, rubbish-disposal places and other waterproofing project, Features: a) Conforms to the national standardsb) SBS modified ... , no apart ElongationMaximum≥30 40 Secondly-Maximum≥ Oil LeakingPieces≤ 2 roof felt App 3.0mm