Rubber Waterstops - SBR, Neoprene or Natural Rubber

Rubber waterstop, made of quality SBR (styrene butadiene rubber), neoprene rubber or natural rubber, is one of the widest types for concrete structure to prevent liquid leaking in or out. Generally, designed to be cast in the concrete, rubber waterstops are ideal for applications where high physical properties of rubber are required. For example, reservoirs, dams and other water retaining or excluding applications with high movements or water pressure.

Features & benefits:

Two types of rubber waterstop, the first one is centerbulb type and the second is dumbbell type
Two types of rubber waterstop – centerbulb type & dumbbell type
  • High elasticity. 
  • High elongation.
  • Excellent high movement accommodation.
  • Capable to withstand high hydrostatic head.
  • Adjust for subsidence and seismic movements.
  • Hot vulcanized site joints.

Applications:

  • Ideal for high movements joints.
  • Water containments.
  • Water excluding.
  • Tunnels and civil engineering structures.
  • Water and waste treatments.
  • Dams, reservoirs, and spillway.
  • Chemical areas. 
  • Irrigation canals, sea walls and culverts.
Plan drawing of two dumbbell rubber waterstops in different length
Rubber waterstop - dumbbell type

Main types:

  • Dumbbell type

    Dumbbell type water stops, with flat web section, are ideal for construction and partial contraction joints with little or no movements.

    Plan drawing of four center bulb types of rubber waterstops in different length
    Rubber waterstop – center bulb type
  • Center bulb type

    Center bulb type waterstop, as its name implies, features its center bulb which makes it ideal for contraction and expansion joints including high lateral, transverse and shear movements. Meanwhile, it is perfect for withstanding the subsidence of the joints.

As your request, other types including ribbed type, splitting type, base type or capping type can be made to your order.

Installation:
All the rubber waterstops are designed to cast in the concrete as an integral joint sealing system. Pre-fabricated waterstops are also supplied to reduce site jointing.

Materials properties
SBR and neoprene rubber, as the most common materials for rubber waterstop manufacturing, are used extensively in United States and the worlds. The SBR water stop is preferred for water containment, while neoprene rubber waterstops are recommend for applications of sewage disposal or chemical industries. As your request, natural rubber, EPDM, Nitrile and Silicone waterstops are also available.

Physical properties Test methods SBR High tensile neoprene rubber Natural rubber
Water absorption 2 days at 70°C (% change) ASTM D-471 5% (max) 5% (max) 5% (max)
Hardness shore A ASTM D-2240 65 65 65
Tensile strength ASTM D- 412 3000 psi (min) 2500 psi (min) 3500 psi (min)
Tensile strength at 300% Modulus ASTM D-412 1150 psi (min) 1150 psi (min) 1450 psi (min)
Ultimate elongation ASTM D-412 450% (min) 450% (min) 500% (min)
Compression set 22 hours at 70°C (% original deflection) ASTM D-395 30% (max) 40% (max) 30% (max)
Accelerated aging 96 hours at 70°C (% of tensile strength before aging) ASTM D-573 80% (min) 80% (min) 80% (min)
Accelerated aging 96 hours at 70°C (% of elongation before aging) ASTM D-573 80% (min) 80% (min) 80% (min)
Ozone resistance 7 days at 50 PPHM at 70°C, 20% elongation ASTM D-1149 No crack No crack No crack