What is Chlorosulfonated Polyethylene CSM CAS 68037-39-8?

Chlorosulfonated Polyethylene CSM CAS 68037-39-8 is a synthetic rubber made by reacting polyethylene with chlorine and sulfur dioxide. It is also known as CSM rubber or generically as chlorosulfonated polyethylene, formerly associated with the Hypalon brand.

Why is CSM rubber resistant to weathering and ozone?

CSM has a saturated polymer backbone with few reactive double bonds, so it is less susceptible to attack by ozone, oxygen and UV light than many unsaturated rubbers. This makes it suitable for outdoor and exposed applications.

What are the main applications of CSM?

It is used in roofing membranes, pond liners, hoses, cable jackets, conveyor belts, seals, gaskets, coatings and corrosion-resistant linings. Grades are selected based on processing method and required balance of oil, chemical and weathering resistance.

What do chlorine content, sulfur content and Mooney viscosity indicate?

Chlorine and sulfur content affect hardness, chemical resistance, oil resistance and crosslinking behavior. Mooney viscosity indicates processing viscosity and influences whether a grade is better suited to extrusion, calendering, molding or solution coating.

How should CSM be stored and handled?

Store CSM in a cool, dry area in its original packaging, away from direct sunlight and moisture. Keep it away from strong oxidizers and sources of ignition, and follow the supplier's safety data sheet for handling and disposal.

Chlorosulfonated Polyethylene CSM CAS 68037-39-8

Chlorosulfonated Polyethylene (CAS 68037-39-8), commercially known as CSM Rubber (and historically associated with the Hypalon® brand), is a high-performance synthetic elastomer utilizing its saturated chemical backbone to provide exceptional resistance to weathering, ozone, and corrosive chemicals. Chemically identified as a chlorosulfonated derivative of polyethylene, this white to pale yellow rubbery solid functions to bridge the gap between thermoplastics and thermoset rubbers, offering superior color stability and oil resistance compared to standard neoprene. As a specialized Halogenated elastomer, it is extensively integrated into heavy-duty wire and cable sheathing, automotive fuel hoses, and industrial roofing membranes where long-term durability against UV radiation and oxidizing acids is critical. We ensure bulk supply capabilities for this material, providing access to competitive factory pricing and customized specifications to meet specific Mooney viscosity (e.g., CSM 20, CSM 40) and chlorine content requirements. Full technical documentation, including MSDS, TDS, COA, is available to support compliance and safety protocols.

CAS: 68037-39-8
Synonyms: CSM Rubber, Hypalon (Brand equivalent), Chlorosulfonated polyethylene rubber, Sulfonyl chloride polyethylene, Synthetic rubber CSM
Einecs: 202-905-8
Molecular Formula: (C2H3Cl)m.(C2H4SO2Cl)n
Grade: Industrial Grade
Package: 25kg/Polypropylene (PP) Woven Bag or Kraft Paper Bag with PE liner.

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Product Description

Chlorosulfonated Polyethylene (CSM) is a high-performance synthetic rubber material produced by the reaction of polyethylene with chlorine and sulfur dioxide. This saturation process gives the polymer a completely saturated main chain, providing exceptional resistance to environmental factors.

Our CSM Rubber is characterized by its superior resistance to ozone, weathering, ultraviolet (UV) light, and strong oxidizing chemicals. It also exhibits excellent color stability, oil resistance, and thermal stability (up to 150°C). It is widely used as a raw material for specialty rubber products requiring durability in harsh conditions. We offer various grades with different chlorine contents and Mooney viscosities to suit extrusion, calendering, and molding processes.

1 Physicochemical Properties

2 Applications

3 Storage Conditions

4 Safety Precautions

Physicochemical Properties

The following specifications cover our standard range of export grades (Typical data for CSM-20, CSM-30, CSM-40 series):

Test Item	Specification	Note
Appearance	White to pale yellow chips	Clean, free of foreign matter
Chlorine Content	29.0% – 43.0%	Adjustable by Grade
Sulfur Content	1.0% – 1.5%	—
Mooney Viscosity (ML 1+4, 100°C)	30 – 100	Low to High Viscosity avail.
Volatile Matter	≤ 0.5%	—
Ash Content	≤ 0.3%	—
Tensile Strength	≥ 25.0 MPa	(Vulcanizate property)
Elongation at Break	≥ 450%	(Vulcanizate property)
Specific Gravity	1.11 – 1.26 g/cm³	Depends on Chlorine content
Solubility	Soluble in aromatic hydrocarbons (Toluene, Xylene)	—

Applications

CSM Rubber is a versatile elastomer used in demanding industrial sectors:

Automotive Industry:
- Used for fuel hoses, power steering hoses, hydraulic hoses, and spark plug boots due to its oil and heat resistance.
- Air intake ducts and emission control components.
Wire & Cable:
- Premium sheathing and jacketing material for mining cables, shipboard cables, and nuclear power plant cables.
- Provides excellent flame retardancy and weather resistance.
Industrial Rubber Goods:
- Rubber Rollers: Used in steel mills and printing due to abrasion and chemical resistance.
- Linings: Chemical resistant tank linings and pond liners.
- Belts: Synchronous belts and V-belts.
Marine & Outdoor:
- Inflatable Boats: Coating material for fabrics used in high-end inflatable boats and life rafts.
- Waterproofing: Single-ply roofing membranes and construction waterproofing.
Adhesives & Coatings:
- Used as a base for high-performance adhesives and anti-corrosion paints.

Storage Conditions

Environment: Store in a cool, dry, and well-ventilated warehouse.
Temperature: Maintain storage temperature below 30°C.
Protection: Keep away from direct sunlight, rain, and moisture. The material is sensitive to UV in its raw form before compounding.
Stacking: Do not stack pallets too high to prevent the chips from blocking (sticking together) due to pressure.
Shelf Life: typically 24 months from the date of manufacture if stored correctly.

Safety Precautions

Handling: Wear industrial gloves and safety glasses. Use in a well-ventilated area.
Processing Safety: During vulcanization or high-temperature processing, trace amounts of Hydrogen Chloride (HCl) and Sulfur Dioxide (SO2) may be released. Ensure manufacturing facilities have adequate exhaust ventilation.
Fire Safety: While CSM has flame-retardant properties, the raw material can burn. In case of fire, use water spray, foam, or dry powder extinguishers.
Skin Contact: Wash thoroughly with soap and water after handling.
Disposal: Dispose of waste according to local environmental regulations (Non-hazardous solid waste).

FAQ - Technical & Supply Chain

Q:
What is Chlorosulfonated Polyethylene CSM CAS 68037-39-8?

A: Chlorosulfonated Polyethylene CSM CAS 68037-39-8 is a synthetic rubber made by reacting polyethylene with chlorine and sulfur dioxide. It is also known as CSM rubber or generically as chlorosulfonated polyethylene, formerly associated with the Hypalon brand.
Q:
Why is CSM rubber resistant to weathering and ozone?

A: CSM has a saturated polymer backbone with few reactive double bonds, so it is less susceptible to attack by ozone, oxygen and UV light than many unsaturated rubbers. This makes it suitable for outdoor and exposed applications.
Q:
What are the main applications of CSM?

A: It is used in roofing membranes, pond liners, hoses, cable jackets, conveyor belts, seals, gaskets, coatings and corrosion-resistant linings. Grades are selected based on processing method and required balance of oil, chemical and weathering resistance.
Q:
What do chlorine content, sulfur content and Mooney viscosity indicate?

A: Chlorine and sulfur content affect hardness, chemical resistance, oil resistance and crosslinking behavior. Mooney viscosity indicates processing viscosity and influences whether a grade is better suited to extrusion, calendering, molding or solution coating.
Q:
How should CSM be stored and handled?

A: Store CSM in a cool, dry area in its original packaging, away from direct sunlight and moisture. Keep it away from strong oxidizers and sources of ignition, and follow the supplier's safety data sheet for handling and disposal.

Ordering & Documentation

Key information for document requests, quotations, and supply planning.

Documents

COA, TDS, SDS/MSDS and packing details are available on request.

Quotation

Send the CAS number, grade, quantity, packing preference and destination.

Sample & Supply

Support is available for samples, trial orders, bulk and repeat supply.

Storage & Shipping

Product-specific conditions are confirmed before order.

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