RUBBER BALLOON

Inflatable rubber balloon, also called pneumatic rubber air bag, is used for making concrete pre-casting formwork projects in culvert bridge construction.

Pneumatic formwork for in-situ cast of concrete pipes or for making precast elements

Material:

Rubber balloon is made from natural rubber and fabric. in general, rubber balloon 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, the rubber balloon 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
Terence of Thickness, mm	3.20.2(1+2) 5.00.2(2+3)
Hardness(Shore A)	655
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; the length of impurities trace is not more than 3mm; the depth is not more than 1.5mm; the quantity of the trace is not more than one; the deformation is not more than 2mm.

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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