... anti-aging, 3 anti-leaking, erosion resistant, PN (BW) waterstop strip is a new type of waterproof building material with self ... long-term repeated expansion. Main usages: PN (BW) waterstop strip is a kind of newest, best anti-seeping material used ... , waters, traffic tunnel, power plant cooling towers, municipal water supply and drainage etc concrete construction projects, which completely resolves the ...