used as formwork for making hollow concrete pipe, for constructing clevert, drainage, sewer, rubber balloon in China
PNEUMATIC TUBULAR FORM
Pneumatic tubular form is used for making concrete pre-casting formwork projects in culvert bridge construction.
Material:
Pneumatic tubular form 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.
Technical Parameters
Items | Index |
Thickness, mm | 3.2±0.2(1+2) 5.0±0.2(2+3) |
Hardness(Shore A) | 65±5 |
Adhesive tension of rubber and fabric,N/25mm | ≥8 |
Tensile strength, M pa | ≥12 |
Elongation at break, % | ≥350 |
300% Stretch set length, M Pa | 6 |
Stretch for deformation ratio | ≤20 %(Prevent distortion) |
Suitable temperature,°C | -10~80 |
Appearance | No cracks, no bubbles on the surface; |
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 |
700 | 0.02 |