Introduction
When designing seals, gaskets, or protective coatings for chemical, outdoor, or high-temperature environments, engineers often narrow their choices to three proven elastomers:
- CSM (Chlorosulfonated Polyethylene, known historically as Hypalon®)
- EPDM (Ethylene Propylene Diene Monomer)
- FKM (Fluoroelastomer, often known by the trade name Viton®)
Each offers unique benefits. Below is a technical side-by-side to help you select the best material for your application.
Need a detailed chemical chart?
See the CSM Chemical Compatibility Chart
Quick Comparison Table
| Property / Feature | CSM (Hypalon®) | EPDM | FKM (Viton®) |
| Operating Temp. Range | –40 °C to +130 °C (short peaks to 150 °C) | –50 °C to +150 °C (some up to 170 °C) | –20 °C to +200 °C (special grades to 250 °C) |
| Ozone / UV / Weathering | Excellent – retains properties for decades outdoors | Excellent | Good – can chalk slightly under continuous UV |
| Chemical Resistance | Excellent vs. acids, alkalis, oxidizers; fair vs. oils | Good vs. water, steam, mild chemicals; poor vs. oils/fuels | Outstanding – resists fuels, oils, strong chemicals |
| Fuel & Oil Resistance | Fair to Poor | Poor | Excellent |
| Cost (relative) | $$ (moderate) | $ (economical) | $$$ (premium) |
| Typical Applications | Roofing membranes, marine coatings, tank linings, chemical gaskets | Automotive cooling systems, water seals, steam hoses | Aerospace fuel seals, chemical plant O-rings, automotive under-hood |
Key Insights for Material Selection
- Chemical Exposure
- Strong Acids / Oxidizers → CSM excels.
- Automotive fuels / Hydrocarbons → FKM is best.
- Hot water / Steam → EPDM leads.
- Outdoor & UV Stability
- Both CSM and EPDM outperform FKM for continuous sunlight and ozone.
- CSM offers superior color retention, valuable for architectural and marine applications.
- Temperature Range
- FKM covers the widest high-temperature range.
- EPDM performs well at low temperatures (down to –50 °C).
- CSM is a balanced choice when UV + chemical exposure is critical.
Typical Industry Applications
- CSM: Roofing membranes, inflatable boats, chemical tank linings, expansion joints.
- EPDM: Automotive weatherstripping, steam hoses, potable water seals.
- FKM: Aerospace fuel systems, chemical processing gaskets, high-temperature O-rings.
Explore YQXPOLYMER CSM Grades → CSM Product Overview
Cost vs. Lifecycle Value
- EPDM: Lowest material cost; ideal for water/steam but not for oil or aggressive chemicals.
- CSM: Mid-range price; offers the best balance of chemical and weathering resistance for long-term outdoor use.
- FKM: Highest cost but unmatched for chemical and high-temperature resistance—worth it for critical aerospace or chemical plant applications.
Why Choose YQXPOLYMER CSM
YQXPOLYMER supplies high-purity, spray-grade CSM designed for demanding marine, infrastructure, and chemical markets:
- Consistent viscosity and particle size for predictable compounding
- Compliance with REACH, RoHS, and ISO 9001
- Technical support for custom formulations and blends
Request a sample or consultation → Contact YQXPOLYMER
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