What Is Hypalon® (CSM)? Why It’s the Best Fabric for Inflatable Boats
Why It's Still the Gold Standard for Inflatable Boat Fabric in the U.S.
When it comes to inflatable boats, RIBs (Rigid Inflatable Boats), and professional marine equipment, the fabric you choose directly impacts durability, safety, and long-term cost of ownership.
One material continues to stand above the rest in demanding marine environments: Hypalon®, more accurately known today as CSM (Chlorosulfonated Polyethylene).
In this guide, we explain what Hypalon is, why it remains the preferred choice for serious boaters and professionals in the United States, and how it compares to alternatives like PVC.
What Is Hypalon®?
Origin and industry background
Hypalon® was originally a DuPont trademark, developed in the 1950s to describe a high-performance synthetic rubber known chemically as CSM (chlorosulfonated polyethylene).
Although DuPont discontinued Hypalon production in 2010, the term "Hypalon" is still widely used in the marine industry to describe premium CSM fabrics used for inflatable boats, military craft, rescue vessels, and professional-grade RIBs.
Important clarification for U.S. buyers: Today's "Hypalon" boat fabrics are technically CSM-based materials that meet or exceed the original Hypalon performance standards.
Chemical Composition and Performance Characteristics
CSM rubber is produced by chemically modifying polyethylene with chlorine and sulfur compounds. This structure gives Hypalon/CSM its exceptional resistance to environmental stressors, including:
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Intense UV exposure
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Saltwater and humidity
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Ozone and air pollution
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Extreme temperatures
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Oils, fuels, and many chemicals
The result is a fabric that remains flexible, strong, and stable for decades, even in harsh outdoor conditions.
Hypalon vs Other Inflatable Boat Materials
Key advantages of Hypalon (CSM)
Compared to PVC and neoprene-based fabrics, Hypalon offers clear long-term benefits:
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Superior UV resistance - ideal for boats stored outdoors year-round
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Outstanding durability - resists cracking, fading, and delamination
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Excellent abrasion resistance - perfect for docks, beaches, and rescue use
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Chemical and fuel resistance - safe around gasoline, cleaners, and saltwater
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Repair-friendly - can be patched reliably even years later
Are there any drawbacks?
The main downside of Hypalon is higher upfront cost compared to PVC. However, for many U.S. boaters and professionals, this is offset by:
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Longer service life
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Fewer repairs
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Better resale value
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Lower total cost over time
Marine Applications: Where Hypalon Excels
Inflatable boats and RIBs
Hypalon is widely regarded as the best fabric for inflatable boats and RIB tubes, especially for:
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Offshore and coastal boating
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Professional and commercial use
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Law enforcement and rescue boats
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Fishing and dive boats
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High-UV regions (Florida, California, Gulf Coast)
Its resistance to sun, salt, and abrasion makes it ideal for demanding American boating conditions.
Dock protection and marine accessories
Hypalon is also commonly used for:
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Dock bumpers and fenders
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Buoys and flotation devices
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Dive and rescue equipment
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Protective marine covers
Aerospace, Industrial, and Other Uses
Beyond marine applications, Hypalon/CSM is valued in industries where failure is not an option, including:
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Aerospace sealing gaskets and O-rings
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Fuel tank linings and protective coatings
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Chemical storage tanks
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Industrial hoses and piping systems
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Protective clothing and industrial safety gear
Why Hypalon Performs So Well
Exceptional weather and UV resistance
Hypalon maintains its strength and flexibility even after years of sun exposure, unlike many PVC fabrics that become brittle over time.
High abrasion resistance
Its tough outer surface resists scuffs, impacts, and repeated friction - critical for boats that frequently contact docks, trailers, or rocky shorelines.
Flexibility in extreme temperatures
Hypalon stays flexible in both hot and cold climates, making it suitable for use from tropical regions to cold-water environments.
Strong chemical resistance
The material resists oils, fuels, grease, acids, and cleaning agents, making it ideal for real-world marine use.
Maintenance Tips for Hypalon Boats
Proper care can extend the lifespan of Hypalon fabric even further:
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Rinse regularly with fresh water
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Clean using mild soap only
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Avoid harsh solvents and abrasive cleaners
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Store away from direct sunlight when possible
Related guide: Repairing vs. Replacing RIB Tubes: How to Make the Right Call
Hypalon vs PVC: Which Should You Choose?
PVC inflatables are often lighter and more affordable, making them suitable for occasional recreational use.
However, for boaters who prioritize:
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Longevity
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Repairability
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Resistance to sun and salt
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Professional-grade performance
Hypalon (CSM) remains the superior choice.
Why Orca Retail Uses Hypalon Repair Fabrics
Hypalon (CSM) remains the benchmark material for inflatable boats and RIBs in the U.S. Its unmatched resistance to UV exposure, chemicals, abrasion, and weather makes it the preferred choice for anyone who depends on their boat - not just uses it occasionally.
Choosing Hypalon isn't just about material quality; it's about long-term reliability, safety, and peace of mind on the water.
At Orca Retail, our Hypalon repair materials are designed to:
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Match original inflatable boat fabrics
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Bond reliably with long-lasting adhesives
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Withstand UV, saltwater, and abrasion
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Deliver professional-grade, durable repairs
For boat owners and professionals alike, this means repairs you can trust - even in demanding marine conditions.
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