Culvert balloon is used for making concrete pre-casting formwork projects in culvert bridge construction.
Material:
culvert balloon is made from natural rubber and fabric. In general, it is formed by three layers(1+2=2layers of rubber and 1 layer fabric): inner layer is high strength synthetic polymer fabric withstanding the force from concrete and air pressure. Outer layer is vulcanized rubber. Rubber hardness is about 65Shore A to keep its excellent features, such as soft, durable, wear-resistance.
If your concrete slab is thicker, it should be manufactured in 2layers of fabric and 3layers of rubber(2+3).
Standard specification
1- diameter from 0.2m to 3m,(round)
2- total length from 1m to 28m(round)
3- other specifications are also available according to clients’ request.
Working Pressure
| Diameter(mm) | Pressure(Mpa) |
| 150 | 0.08 |
| 160~190 | 0.08 |
| 200~220 | 0.07 |
| 230 | 0.06 |
| 240~280 | 0.05 |
| 300~370 | 0.045 |
| 380~480 | 0.04 |
| 500~520 | 0.035 |
| 550~600 | 0.03 |
| 620~680 | 0.025 |