Culvert rubber balloon, is made from high strength synthetic rubber and canvas cloth, by high temperature vulcanization.
It is popular used in China domestic, Kenya, Nigeria, Tanzania etc. projects, for bridge culvert concrete beam making. It plays in the role of inflatable core mold, inflatable mandrel, before concrete pre-casting, for concrete tubular forms.
Comparing with plastic or steel form work, culvert rubber balloon / airbag is more portable, easy to handle. What's more, it is also more economical. At last, it is also easy to store, and is reusable for many times.
Pictures for culvert rubber balloon
Please pay more attention, no over pressure when inflating the culvert rubber balloon:
Technical Parameters of culvert rubber balloon:
Tolerance of thickness, mm
Hardness (shore A)
Adhesive tension of rubber & fabric N/25mm
Tensile strength, Mpa
Elongation at break, %
300% stretch set length, Mpa
Stretch for deformation ratio
≤20% (prevent distortion)
Suitable temperature ℃
No cracks, no bubbles on the surface,The length of imputities trace is no more than 3mm, the depth is no more than 1.5mm, the quantity of the trace is no more than one, the deformation is no more than 2mm
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