Waterstop is " A section of flexible waterproofing material placed at any joint in concrete to prevent passage of water ". Joints in concrete structures, one side is subject to hydrostatic load, are provided with waterstops bridging the joints and embedded in concrete on either side. In concrete joints where expansion and contraction cause the joints to close and open, waterstop then are designed to accommodate itself to such movements. Flexijoint Natural Rubber Waterstops are superior in performance than metal or pvc withstanding shear movements resisting hydrostatic pressure. Flexijoint Natural Rubber Waterstop have greater ultimate elongation of minimum 400% greater than PVC and will continue returning to near original shape after repeated movement. They have lower compression set and perform well at low temperatures. Flexijoint Natural Rubber ( NR ) series Waterstop is moulded from high grade valcanised natural rubber compound and free from reclaimed rubber or vulcanized waste.Flexijoint NR Waterstop widely applied in construction industry. Flexijoint Natural Rubber ( NR ) Waterstop " Dumbell Plain Web " Series.Size 150mm and 230mm width suitable for construction, kicker and partial contraction joints where no shear movement is possible. Flexijoint NR Waterstop Application: Dams, Canals, Culverts, Spillways, Tunnels, Water Towers, Swimming Pools, Reservoirs, Sewerage Tanks, Basements Substructures & Underground Car Parks, Subways, Roof Decks and Podium Areas.