... , anti-aging, 3 anti-leaking, erosion resistant, PN (BW) waterstop strip is a new type of waterproof building material with self ... , compact the gaps between new and old concrete, to form watertight plasticity colloid. This product passed ministry-level appraisal in Beijing ... after long-term repeated expansion. Main usages: PN (BW) waterstop strip is a kind of newest, best anti-seeping material used ...