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Aslan Kaucuk


  • EPDM RUBBER COMPOUND

  • EPDM Chemistry and Compounding
    Ethylene-propylene elastomers share the same monomers as the thermoplastic polymers polyethylene (PE) and polypropylene (PP). Depending on polymer composition and how the individual monomers are combined, ethylene-propylene rubbers can be produced in a wide range of families ranging from amorphous, non-crystalline to semi-crystalline structures. These polymers can also be produced in a wide range of Mooney viscosities.

    When compounded and combined, the ethylene and propylene monomers of EPDM form a chemically saturated, stable backbone that provides excellent resistances to ozone, heat, oxidation and weathering. From here, a third non-conjugated monomer of diene can be terpolymerized to the polymer to maintain a saturated backbone and subsequently place the reactive unsaturation in a side chain, making it available for vulcanization or polymer modification chemistry. The resulting terpolymers created are referred to as EPDM.

     

    EPDM Rubber Material Properties
    General Characteristic

    Durometer Range (Shore A) 30-90
    Tensile Range (P.S.I) 500-2500
    Elongation (Max %) 600
    Compression Set  Good
    Resilience – Rebound  Good
    Abrasion Resistance  Good
    Tear Resistance  Fair
    Solvent Resistance  Poor
    Oil Resistance  Poor
    Low Temperature Usage (F°)  -20° to -60°
    High Temperature Usage (F°)  Up to 350°
    Aging Weather – Sunlight Excellent
    Adhesion to Metals Fair And Good

     

    Features of EPDM Elastomers
    The different properties of a finished EPDM compound will be largely controlled by the ethylene and Diane content, the Mooney viscosity and the molecular weight distribution.

    Example – Lowering ethylene content will decrease crystalline and thus decrease hardness and modulus.

    The follow table highlights some of the general features in compounding EPDM and the results of having higher or lower levels of specific attributes.

         

    Characteristic High low
    Ethylene Content Flow at High Extrusion Temps. High tensile strength, modulus Good Green Strength High Loading (Reducing Cost) Fast Mixing Calendering and Milling Low Hardness and Module Low Temp. Flexibility
    Diene Content Acceleration Versatility High Modulus, Low Set Good Compression Set Cure Degree and Fast Rate High Heat Stability Low Hardness and Modulus Scorch Resistance
    Molecular Weight Good Modulus and Set High Loading and Oil Extension Good Green Strength Good Tensile and Tear Resistance Collapse Resistance High extrusion rates Low Viscosity, Scorch Resistance Good Calendering Fast mixing
    MWD Good overall processing Collapse Resistance Good Milling and Calendering Extrusion feed and smoothness Fast extrusion rate High Cure Low Die Swell Good Physicals


    EPDM Rubber Applications
    EPDM’s properties allow it to be a widely used, highly versatile, synthetic rubber in both specialty and general purpose applications.

    Since EPDM can be processed to meet a number of different requirements, it has been adopted by many industries for a number of applications including: Automotive weather stripping Glass-run channels EPDM Grommets Automotive seals Radiator, garden and appliance EPDM hoses EPDM Tubing Electrical insulations and stinger covers Roofing membranes EPDM belts Plastic impact modification Rubber mechanical goods Water system O rings and hoses Ozone exposure applications Automotive cooling systems.

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