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 and pvc withstanding shear movements resisting hydrostatic pressure. Flexijoint Natural Rubber Waterstop have greater ultimate elongation minimum 400% 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 extruded from high grade natural rubber compound and free from reclaimed rubber or vulcanized waste. Flexijoint NR Waterstop widely applied in construction industry. Flexijoint Natural Rubber ( NR ) Waterstop " Centre Blub " Series of 150mm, suitable for subsidence, contraction & expansion joints including high movement joints. Other size 115mm, 230mm and 305mm available upon request. 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.