Product · Leak Sealing

External Sealing Bag (Leak-Sealing Air Cushion)

Name: External Sealing Bag
Brand: HANGYIXIAOFANG

Secured with straps over the leak site from outside the pipe, the flat external sealing cushion plugs ruptures in pipes larger than 500 mm in diameter.

External sealing leak-sealing air cushion

A Flat, Fast External Seal for Large-Diameter Pipes

The external sealing cushion is a leak-sealing air cushion for emergency repair of ruptured pipelines with a diameter greater than 500 mm — highly effective, quick to deploy and easy to use in confined spaces.

Highly effective — one inflation provides a long-lasting seal; re-inflate as needed
Rapid deployment — quick-connect couplings and straps secure the cushion over the leak
Flat design — only 12–15 mm thick, ideal for confined spaces
Chemical resistant — passes gasoline, acid and alkali tests

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Performance

Performance Parameters

No.	Item	Test Condition	Indicator
1	High & low temperature resistance	-25°C, 60°C × 2h, 180° fold	Crack-free
2	Gasoline resistance	120° gasoline, 1 h	No cracks, non-sticky
3	Acid resistance	80% H₂SO₄, 60% HNO₃, 30% HCl, 1 h	Impermeable, non-stick, non-brittle
4	Alkali resistance	6.1 mol/L NaOH, 1 h	Impermeable, non-stick, non-brittle