Choosing a rescue lifting air cushion is not just "pick the biggest number." Capacity, working pressure, shape and certification all decide whether a cushion performs safely on the job. This guide walks through what each spec means and how to match a cushion to your scenario.
On this page
Rated capacity & how it is measured
A cushion's rated lift is the maximum load at its rated working pressure. Two points matter:
- Lift height vs capacity. As the cushion inflates, its footprint shrinks and capacity drops. Datasheets should state capacity at a reference height — compare like for like.
- Stacking. Cushions are often stacked to reach height; total capacity is not simply additive — follow the manufacturer's stacking chart.
Square vs spherical
| Square cushion | Spherical cushion | |
|---|---|---|
| Best for | Flat surfaces: vehicles, slabs, containers | Irregular / rounded loads: rocks, cylinders |
| Insertion gap | Needs a thin entry gap | Can be placed where flat access is poor |
| Stability | Wide, stable base | Conforms to shape; use chocks |
Most fleets carry both. See our product range for square and spherical options.
Working pressure & safety factor
Typical rescue cushions run around 0.8 MPa (8 bar). The safety factor — burst pressure vs working pressure — is the real safety number. Ask for the test report; a 3:1 or higher factor is a common expectation. Never exceed rated working pressure.
Material & seams
Look for aramid/Kevlar-reinforced rubber with thermally or chemically bonded seams. Heat, abrasion and repeated cycles age plain rubber faster. A visible wear layer and easy inspection points help field checks.
Hoses, control unit & manifolds
A cushion is only as good as its air system. A complete kit includes:
- A regulated control unit / foot pump or compressor source
- High-pressure hoses with quick couplings
- Manifolds to inflate multiple cushions in sync
- Pressure gauge and relief valve
Standards & certifications
Match the standard your authority accepts. Hangyi builds to Chinese national (GB) standards and can prepare international documentation on request. Confirm the exact certification your tender requires before purchase — do not assume a mark you have not verified.
FAQ
How much capacity do I need?
Estimate the load, add margin, and read capacity at the working height — not the max-height number. Tell us the scenario and we will size it.
Can square and spherical be mixed?
Yes, with a manifold and matched pressure — but follow the stacking/sync guidance from the manufacturer.
What pressure is safe?
Stay at or below the rated working pressure; rely on the certified safety factor, not guesses.
How long do they last?
Depends on use, abrasion and storage. Inspect before each use; retire on any visible damage.
Not sure which cushion fits your scenario?
Describe the load, gap and environment — we will recommend square or spherical and the right rating.