What Is CSM Rubber?
CSM rubber stands for Chlorosulphonated Polyethylene Rubber, a specialty synthetic elastomer known for its exceptional resistance to ozone, UV, and harsh chemicals. CSM rubber is widely recognized under its former DuPont trade name “Hypalon®”, although this product line was discontinued in 2010. Since then, many global manufacturers have developed CSM alternatives, including YQXPOLYMER, a leading Chinese supplier of high-purity CSM rubber for industrial applications.

Is CSM the Same as Hypalon?
Yes. CSM rubber and Hypalon refer to the same class of material—chlorosulfonated polyethylene. “Hypalon” was DuPont’s branded version of CSM, and the name is still widely used informally. Today, top brands like TOSO CSM and YQXPOLYMER CSM rubber continue to serve industries needing high-performance elastomers for demanding environments.

What Is the Full Form of CSM in the Rubber Industry?
In the rubber industry, CSM stands for Chlorosulphonated Polyethylene. It’s produced by chemically modifying polyethylene through chlorination and sulfonation, resulting in a versatile rubber with a unique balance of mechanical and chemical properties.

CSM Rubber Structure
CSM rubber features a saturated backbone derived from polyethylene, which is then chlorosulfonated to introduce reactive sites. This structure provides:
Chlorine groups for flame and chemical resistance
Sulfonyl chloride groups for crosslinking with metal oxides
Saturated backbone for excellent weather and ozone stability
This robust structure is what makes CSM rubber more stable than many other synthetic rubbers in outdoor or chemically aggressive conditions.

CSM Rubber Properties
CSM rubber is prized for its excellent balance of mechanical, environmental, and chemical properties:
Outstanding weather resistance (ozone, UV, aging)
High resistance to acids, alkalis, and oxidizing agents
Flame resistance
Excellent abrasion and flex cracking resistance
Temperature resistance from –40°C to +150°C
Good electrical insulation
Compatible with EPDM, CR, NR, and PVC
These properties make it a go-to material in extreme applications where traditional elastomers fail.

CSM Rubber Chemical Resistance
One of the key advantages of CSM rubber is its broad-spectrum chemical resistance. It withstands:
Acids (sulfuric, nitric, hydrochloric)
Bases (sodium hydroxide, ammonia)
Oxidizing chemicals (bleach, peroxide)
Hydraulic fluids, oils, fuels
Environmental exposure (UV, ozone, salt spray)
This makes it ideal for:
Lining chemical tanks and pipelines
Seals and gaskets in harsh chemical processing
Protective coatings and waterproofing membranes

CSM vs EPDM Rubber
While EPDM rubber is commonly used for its excellent weather resistance and cost-effectiveness, CSM rubber outperforms EPDM in:
Property EPDM CSM Rubber (Hypalon)
UV & Ozone Resistance Excellent Excellent
Acid/Chemical Resistance Moderate Superior
Flame Resistance Low High
Oil/Fuel Resistance Poor Good
Operating Temp Range –50°C to +130°C –40°C to +150°C
For applications where chemical resistance, flame retardancy, and longevity are crucial, CSM rubber is the better choice.

TOSO CSM and Alternatives
TOSO CSM is one of the most commonly searched and used CSM rubber brands since DuPont discontinued Hypalon. It remains a trusted name in Europe and Asia. However, YQXPOLYMER CSM rubber offers a highly competitive and customizable alternative, with grades suitable for extrusion, calendaring, spraying, and molding.

Why Choose YQXPOLYMER CSM Rubber?
YQXPOLYMER is a trusted manufacturer specializing in chlorosulfonated polyethylene rubber with:
High purity white powder grades
Excellent dispersion and processability
Tailored grades for coatings, hoses, linings, seals, cable jackets, and industrial rubber parts
Comprehensive technical support and testing services
REACH-compliant and IMO/UL/ASTM tested grades available
Popular products like YQX-CSM-30L and 45L are engineered to replace TOSO CSM in high-end marine, automotive, and industrial coatings and rubber formulations.

Applications of CSM Rubber
Automotive: fuel hoses, weatherstrips, battery seals
Marine: inflatable boats, cable jacketing, coatings
Construction: roofing membranes, geomembranes
Electronics: cable insulation, wire jackets
Chemical industry: tank linings, hose covers, gaskets
Defense and aerospace: flame-retardant coatings, protective gear

Conclusion
CSM rubber, also known as Hypalon or chlorosulphonated polyethylene, is a high-performance elastomer ideal for demanding applications requiring weatherability, flame resistance, and chemical stability. As one of the top alternatives to TOSO and legacy Hypalon materials, YQXPOLYMER CSM rubber offers reliable, customizable, and high-quality solutions for manufacturers across industries.

📩 Contact YQXPOLYMER Today
To learn more or request technical data sheets and samples, contact:
YQXPOLYMER
📧 Email: [email protected]
📞 Phone / WeChat: +86-135-4070-2776
🌐 Website: www.yqxpolymer.com