Materials of Excellence

Crafting with the Best in the Business

At Julong Rubber, we prioritize using the finest materials to ensure the durability, efficiency, and performance of every product. Explore the various high-quality materials that form the foundation of our premium rubber components.

Chlorosulfonated Polyethylene (CSM)

The Durable Weather and Chemical Resistant Rubber

Chlorosulfonated Polyethylene, commonly referred to as CSM or by its trade name Hypalon, stands out because of its superior resistance to environmental conditions. It possesses an inherent ability to combat degradation from ozone, UV light, and adverse weather conditions, which is why it’s frequently chosen for outdoor applications. Beyond weatherability, CSM is also notably resistant to chemicals, acids, and alkaline substances.

Chlorosulfonated Polyethylene (CSM): Selection

Chlorosulfonated Polyethylene (CSM), commonly known by trade names like Hypalon®, is a highly versatile synthetic rubber valued for its superior resistance to chemicals, ozone, UV rays, and extreme weather conditions. For B2B buyers, understanding the performance of CSM in different applications can help ensure optimal material selection and long-term durability.

This guide offers a deep dive into the types, advantages, and applications of CSM rubber, including detailed technical analysis and selection advice for procurement professionals.

What is Chlorosulfonated Polyethylene (CSM)?

Chlorosulfonated Polyethylene (CSM) is a type of synthetic elastomer derived from polyethylene that has been chlorinated and sulfonated. These chemical modifications enhance the polymer’s resistance to degradation from heat, ozone, UV radiation, and a variety of chemicals.

CSM rubber provides excellent weather resistance, chemical stability, and long-term durability, making it suitable for outdoor and harsh industrial environments.

Types of Chlorosulfonated Polyethylene (CSM)

CSM compounds can be tailored for specific applications by modifying the chlorine and sulfonyl content and through various formulations.

Type	Chlorine Content (%)	Key Features	Applications
Standard CSM	20-40%	General purpose, balanced mechanical and chemical resistance	Industrial hoses, roofing membranes
High Chlorine CSM	Above 40%	Superior chemical and fuel resistance	Chemical linings, oil-resistant gaskets
Low Sulfonyl CSM	Lower SO2 groups	Enhanced flexibility, easier processing	Wire coatings, inflatable structures

What are the Advantages and Disadvantages of Chlorosulfonated Polyethylene (CSM)?

✔️ Advantages

✅ Excellent ozone, UV, and weather resistance
✅ Outstanding chemical resistance, including acids and alkalis
✅ Good heat aging resistance (up to 150°C)
✅ Flame retardant and low smoke emission
✅ Good abrasion and wear resistance
✅ Resistant to oil and fuels (high chlorine grades)

❌ Disadvantages

❌ Poor low-temperature flexibility (typically brittle below -20°C)
❌ Limited dynamic properties compared to EPDM or NBR
❌ Requires special curing agents (peroxide or metallic oxides)
❌ Higher material cost compared to standard rubbers

🔧 Advantages vs. Disadvantages Table

Feature	Advantage	Disadvantage
Weather Resistance	Excellent UV and ozone resistance	Reduced flexibility at low temperatures
Chemical Resistance	Highly resistant to acids and alkalis	Processing complexity with curing systems
Durability	Long service life in harsh environments	Higher initial cost

Application of Chlorosulfonated Polyethylene (CSM)

CSM rubber is highly valued in industries that require robust materials capable of withstanding extreme conditions. Below is a detailed analysis of CSM applications by sector.

🚢 Marine Industry

✅ Applications: Boat covers, inflatable boats, marine hoses
✅ Benefits:
- Excellent resistance to saltwater, UV rays, and marine biofouling
- Long-term durability in offshore conditions
- Non-corrosive and flame-retardant properties improve safety

🔧 Marine Application Performance Table

Material	Saltwater Resistance	UV Resistance	Durability
CSM	Excellent	Excellent	High
Neoprene	Good	Moderate	Moderate
EPDM	Poor	Good	Moderate

🏭 Chemical and Petrochemical Industry

✅ Applications: Chemical storage tank linings, industrial hoses, gaskets
✅ Benefits:
- Resists aggressive chemicals, acids, and alkalis
- Maintains integrity in chemical processing environments
- Flame retardant for added safety in volatile environments

🔧 Chemical Resistance Comparison

Material	Acid Resistance	Alkali Resistance	Fuel Resistance
CSM	Excellent	Excellent	Good
NBR	Moderate	Poor	Excellent
EPDM	Good	Excellent	Poor

🏢 Roofing and Construction Industry

✅ Applications: Waterproof membranes, roofing sheets, expansion joints
✅ Benefits:
- Excellent weather resistance for long-term outdoor use
- UV stability minimizes maintenance
- Low smoke, flame retardant formulations improve building safety

🔧 Roofing Material Comparison

Material	Weather Resistance	Flame Retardancy	Maintenance Requirement
CSM	Excellent	Excellent	Low
EPDM	Good	Moderate	Moderate
PVC	Moderate	Good	High

Is Chlorosulfonated Polyethylene Better Than Neoprene?

While both CSM and neoprene offer good weather and chemical resistance, CSM generally outperforms neoprene in several key areas:

✅ Better UV and ozone resistance
✅ Improved chemical and acid resistance
✅ Higher heat aging stability

However, neoprene remains more flexible at lower temperatures and is often more cost-effective for general-purpose applications.

🔧 CSM vs. Neoprene Performance Table

Property	CSM	Neoprene
UV/Ozone Resistance	Excellent	Good
Chemical Resistance	Excellent	Moderate
Low-Temperature Flexibility	Poor (-20°C)	Good (-40°C)
Cost	Higher	Lower

How to Choose Chlorosulfonated Polyethylene (CSM)?

For B2B buyers, choosing the right grade and formulation of CSM is essential. Below is a selection guide to assist procurement professionals in making the best decision.

🔍 Step 1: Define Application Parameters

✅ Chemical exposure (acids, bases, fuels)
✅ Environmental factors (UV, ozone, weather)
✅ Temperature range (-20°C to +150°C)

🔍 Step 2: Choose the Right CSM Grade

Grade Type	Key Properties	Applications
Standard CSM	Balanced properties for general industrial use	Hoses, membranes
High Chlorine CSM	Superior chemical resistance	Fuel systems, chemical liners

🔍 Step 3: Verify Standards & Compliance

✅ ISO 9001 Certification for quality control
✅ RoHS/REACH compliance for environmental standards
✅ UL94 or FMVSS 302 flame retardancy standards (if required)

📞 Get a Free Quote or Sample of CSM Rubber Components!

At Julong Rubber, we manufacture high-performance CSM rubber parts tailored for the marine, chemical, and construction industries. Our team offers technical guidance and custom formulations to meet your specific needs.