Hypalon® (CSM) tube fabric is the premium collar material for aluminum RIB boats. This article explains the construction, the test data behind it, and when PVC is the smarter spec.
Specifications verified: 2026-08-24
If you have researched rigid inflatable boats, you have seen Hypalon (chlorosulfonated polyethylene, CSM) presented as the premium collar material. Neptunor offers genuine CSM tube fabric on our RIB platforms for exactly the buyers who benefit from it.
What CSM construction looks like
A CSM tube is a laminate: an outer skin of Hypalon® for UV and chemical resistance, neoprene bonding layers, a high-tenacity nylon base fabric for strength, and an inner liner that keeps air where it belongs. The layers are hand-laminated and the seams hot-air welded by certified operators — one reason CSM collars sit on the boats that work hardest.
Why professionals choose it
Fuel spills, oil, solvents, relentless sun and tropical heat are daily reality on commercial decks. CSM resists all of them while staying flexible across extreme temperature ranges, which is why coast guards, rescue services and charter fleets keep specifying it despite the higher cost and longer build time.
How it compares with PVC
High-tenacity PVC is the right answer for most programs: lighter, less expensive, RF-weldable for fully automated seams, and available in far more colors. Our marine PVC retains over 80% of tensile strength after 2,000 hours of xenon-arc UV exposure. For rental fleets and retail ranges it is the efficient choice; for decade-long professional duty, CSM earns its premium.
Choosing fabric for your spec
Material selection is validated in-house, not taken from supplier data sheets — every batch passes tensile, abrasion and low-temperature checks in our fabric lab before release. Compare both fabrics in our <a href="/research/pvc-vs-hypalon">full research guide</a>, walk the <a href="/factory">production lines</a>, or open an <a href="/oem-manufacturing">OEM/ODM project</a> and let our engineers match fabric to your duty cycle.
Need this built under your own brand?
Tell us your project and we reply with MOQ, sample timing and lead times for your market — no commitment.