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The rubber bladder is made of strength canvas and rubber layers. The canvas serves as the force-bearing frame of the dam with good flexural stress resistance and excellent adhesion function. The rubber layers consist of out-layer, middle-layer and inner-layer to protect the canvas.
Physical and mechanical properties of the rubber material for making rubber bladder
| Item | Unit | Outer layer | Middle layer,Inner layer | Cover rubber sheet | Test standard | |
| Tensile strength at break≥ | Mpa | 14 | 12 | 6 | GB/T528-2009 | |
| Elongation at break≥ | % | 400 | 400 | 250 | GB/T528-2009 | |
| Permanent deformation at break≤ | % | 30 | 30 | 35 | GB/T528-2009 | |
| Hardness(shore A) | . | 55~65 | 50~60 | 55~65 | GB/T531.1-2008 | |
| Brittleness temperature≤ | °C | -30 | -30 | -30 | GB/T1682-1994 | |
| Hot air aging (100°C*96h) | Tensile strength at break≥ | Mpa | 12 | 10 | 5 | GB/T3512-2001 |
| Elongation at break≥ | % | 300 | 300 | 200 | GB/T3512-2001 | |
| Hot water aging (70°C*96h) | Tensile strength at break≥ | Mpa | 12 | 10 | 5 | GB/T1690-2010 |
| Elongation at break≥ | % | 300 | 300 | 200 | GB/T1690-2010 | |
| Volume expansion ratio≤ | % | 15 | 15 | 15 | GB/T1690-2010 | |
| Ozone aging: 10000pphm, temperature 40°C, stretching 20%, no cracking | min | 120 | 120 | 100 | GB/T7762-2003 | |
| Wear loss( | cm³/1.61km | 1.0 | 1.0 | 1.2 | GB/T1689-1998 | |
Inflatable rubber dam,inflatable rubber bladder Chinese manufacturer
