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770*530mm rectangle inflated formwork used for box culvert construction
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 |
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