The core of inflatable-gear sealing is pressure retention: inflation points, seams, and functional openings must hold air for long periods. Airtight waterproof zippers solve the openable-yet-airtight paradox — a TPU airtight zipper at the opening, combined with high-frequency welding, keeps sealing through repeated open/close cycles.
Three sealing pain points for inflatables
- Leaks: slow pressure loss at seams and openings.
- Aging: material embrittlement under sun and saltwater.
- Cold hardening: elasticity drops in winter, hurting sealing.
Where zippers are used on inflatables
- Dry storage bags and floats.
- Inflation valve covers.
- Hull access openings.
- Inflatable tent doors and windows.
Material & process recommendations
- TPU airtight zippers (#5/#8), hydrolysis-resistant, ideal for long-term outdoor use.
- High-frequency welded seams + seamless lamination to avoid needle-hole leaks.
- Match sealing pressure: #5/#8 suits low-to-mid pressure (a few to tens of kPa); #10 for high pressure.
Testing recommendations
- Pressure-retention test: inflate and observe pressure drop over time.
- Cycle fatigue test: verify sealing over long-term use.
YILON: YILON offers custom solutions for inflatables: #5/#8 TPU airtight zippers with custom length and color, plus sample validation of sealing pressure and lifespan.