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Waterstop is widely used in construction concrete joints.It is to reach waterproof standards of construction joints, by increasing combination areas of two concrete construction / placement.Feature:
| 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 |
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