Description of dumb bell rubber water stop:
dumb bell rubber water stop, 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 andother water retaining or excluding applications with high movements or water pressure.
Materials properties of dumb bell rubber water stop:
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 |
Applications of dumb bell rubber water stop:
1.Ideal for high movements joints.
2.Water containments.
3.Water excluding.
4.Tunnels and civil engineering structures.
5.Water and waste treatments.
6.Dams, reservoirs, and spillway.
7.Chemical areas.
8.Irrigation canals, sea walls and culverts.
Main types:
1.Dumbbell type water stops, with flat web section, are ideal for construction and partial contraction joints with little or no movements
2.Center bulb type water stop, 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.
Installation of dumb bell rubber water stop :
All the rubber water stops are designed to cast in the concrete as an integral joint sealing system. Pre-fabricated waterstops are also supplied to reduce site jointing.
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