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    • Chlorosulfonated Polyethylene CSM CAS 68037-39-8

    Chlorosulfonated Polyethylene CSM CAS 68037-39-8

    Chlorosulfonated Polyethylene, CAS 68037-39-8, also known as CSM rubber, is a saturated synthetic rubber supplied for outdoor, automotive, wire and cable, marine and industrial applications. Confirm the required grade and specification, then request a quotation with COA/TDS/SDS for bulk supply.

    • 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, CAS 68037-39-8, also called CSM rubber, is a high-performance synthetic rubber.

    Synonyms: CSM Rubber; Hypalon (Brand equivalent); Chlorosulfonated polyethylene rubber; Sulfonyl chloride polyethylene; Synthetic rubber CSM.

    CAS: 68037-39-8.

    It is made by reacting polyethylene with chlorine and sulfur dioxide, giving a saturated polymer backbone.

    It appears as white to pale yellow chips, clean and free of foreign matter.

    It has a chlorine content of about 29.0–43.0% and sulfur content of about 1.0–1.5%, adjustable by grade.

    It has a Mooney viscosity (ML 1+4, 100 °C) of about 30–100 and specific gravity of 1.11–1.26.

    It is resistant to ozone, weathering, UV light and strong oxidizing chemicals.

    It offers excellent color stability, oil resistance and thermal stability up to about 150 °C.

    It is used in automotive fuel, power-steering and hydraulic hoses and spark plug boots.

    It is used as cable sheathing and jacketing for mining, shipboard and nuclear power cables.

    It is used in rubber rollers, chemical-resistant tank linings, pond liners and belts.

    It is used as coating material for inflatable boats, life rafts and single-ply roofing membranes.

    It is used as a base for high-performance adhesives and anti-corrosion coatings.

    Confirm appearance, chlorine content, sulfur content, Mooney viscosity, volatile matter, ash, tensile strength, elongation, specific gravity and solubility.

    Store in a cool, dry area in original packaging, away from direct sunlight, moisture, strong oxidizers and ignition sources.

    Confirm packaging with the requested quantity and destination requirements.

    The page is an RFQ entry point and does not state stock, price, MOQ or fixed lead time.

    For an RFQ, state the intended use, required grade and specification, quantity, packaging, destination and document needs.

    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.

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