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Cetco Waterstop-RX | Expanding Concrete Joint Waterstop


Product Data Sheet 

Waterstop-RX is a hydrophilic strip waterstop designed to stop water infiltration through cast-in-place concrete construction joints by expanding upon contact with water to form a positive seal against the concrete. The key to Waterstop-RX’s effectiveness is its superior expansion to seal and fill voids and cracks in the concrete. Waterstop-RX is an active bentonite/butyl-rubber based waterstop that is designed to replace passive PVC/Rubber dumbbell waterstops, thereby eliminating the requirement of special pieces, split-forming and seam welding. Waterstop-RX has been successfully tested by independent testing firms to over 60 meters (200 feet) of hydrostatic water pressure, under both continuous immersion and wet/dry cycling.

Waterstop-RX is available in three sizes and shapes (see Product Table). Waterstop-RX 101 is produced in a rectangular shape measuring 25 x 19 mm (1” x 3/4”). Waterstop-RX 101T is produced in a trapezoidal shape measuring 31 x 12 mm (1-1/4” x 1/2”) with a reinforcing plastic scrim embedded in the top surface for high tensile strength. The patented trapezoidal shape distributes the expansive force over a greater area and allows the concrete to flow more readily over the product during placement. Waterstop-RX 102 is produced in a halfcircle (Crescent) shape measuring 19 x 9 mm (3/4” x 3/8”).

Though Waterstop-RX possesses good resistance to many chemicals, the waterstop is not intended to be used as the primary joint sealant for chemical containment vessels. Consult manufacturer for guidance regarding chemical compatibility for secondary chemical containment applications. Additionally, Waterstop-RX is not an expansion joint sealant; contact CETCO for expansion joint applications


Applications include both vertical and horizontal non-moving concrete construction joints, new to existing concrete construction, irregular surfaces, and around through-wall penetrations, such as plumbing and utility pipes. Additionally Waterstop-RX can seal around concrete pilings and steel H-piles passing through the slab. Waterstop-RX works in both continuous hydrostatic and intermittent hydrostatic conditions. Waterstop-RX products are designed for reinforced structural concrete with a minimum of 20N/mm2 (3,000 psi) compressive strength. RX-101 and RX-101T are designed for concrete 200 mm (8”) thick or greater with two rows of reinforcing steel. RX-102 is designed for vertical concrete 150 mm (6”) thick or greater; and horizontal concrete no less than 100 mm (4”) thick. RX-102 should be used in concrete with one row of steel reinforcement, concrete curbs, planter walls, fountains, and lightweight structural concrete. Waterstop-RX is a reliable, cost-effective means to stop water infiltration through concrete cold joints. It can also be used around pipe and structural penetrations

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