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IntroductionBentonite waterstop is a kind of strip-shaped seal material by many material mixing and extrusion,Website:http://www.long-wee.com, possessed meeting water swelling and self – adhesive to the concrete construction joints. Wrapping up by concrete, it expands gradually to block the crack and tighten the interface. Concrete structure gets high water resistance pressure. It is a perfect water-proofing product  for concrete construction joint. Application scopeWidely used in metro, pond, sewage plant, tunnel, culvert , concrete construction joint, component joint, pipe joint in shield co