EPM – Ethylene Propylene Rubber

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    Product name: EPM (ethylene propylene rubber)

    Mark: LS-T770, LS- T771, LS- T771P, LS- T772, LS- T773, LS- T774, LS- T776

    LS-T770, 771, 771P are solid amorphous olefin copolymers designed to increase the viscosity index for high and medium-grade motor oils. They are characterized by good low-temperature properties and degradation stability.

    LS-T772 is a solid amorphous olefin copolymer designed to increase the viscosity index of high and medium-grade motor oils. It possesses good low-temperature properties and thickening capacity.

    LS-T773, 774, 776 are solid amorphous olefin copolymers designed to increase the viscosity index of medium and low-grade motor oils. It possesses a good thickening capacity.


    Ethylene-propylene rubbers and elastomers (also called EPDM and EPM) continue to be one of the most widely used and fastest growing synthetic rubbers having both specialty and general-purpose applications. Sales have grown to 870 metric tons (or 1.9 billion pounds) in 2000 since commercial introduction in the early 1960’s. Polymerization and catalyst technologies in use today provide the ability to design polymers to meet specific and demanding application and processing needs. Versatility in polymer design and performance has resulted in broad usage in automotive weather-stripping and seals, glass-run channel, radiator, garden and appliance hose, tubing, belts, electrical insulation, roofing membrane, rubber mechanical goods, plastic impact modification, thermoplastic vulcanisates and motor oil additive applications.

    A preparation method for an ethylene-propylene copolymer viscosity index improver comprises firstly adding 80 parts of base oil in 100 parts of base oil into a reaction vessel, heating with stirring, then adding cut ethylene-propylene copolymer into the reaction vessel, raising the temperature of the reaction vessel, and stirring to dissolve a part of the ethylene-propylene copolymer; and then rapidly heating the reaction vessel, finally adding the residual 20 parts of base oil in the 100 parts of base oil into the reaction vessel, stirring uniformly, and naturally cooling, so as to obtain the lubricating oil viscosity index improver.

    Ethylene-propylene rubbery copolymers having a high degree of random polymerization are produced by employing a high activity, stereoregular polymerization catalyst comprising a titanium halide-containing procatalyst, an organoaluminum compound cocatalyst and a moderately hindered aromatic nitrogen heterocycle as selectivity control agent. The ethylene-propylene copolymer has good properties and exhibits improved processability.

    Viscosity index improver products based on ethylene prolylene copolimers are primarily used in blending engine oils for all grades. They can boost the viscosity efficiently and the viscosity index of the lubricating oils. These products also have good compatibility with pour point depressants.

    Ethylene and propylene are both plastics on their own. However, when copolymerized, the resulting material has a heterogeneous structure, which has rubber-like characteristic.

    It is known that, in typical cable-insulating materials, chemically cross-linked polyethylene and ethylene-propylene rubber are superior in radiation resistance. It has also been found that the dose rate effect on the radiation deterioration of the materials depends upon the deterioration rate due to oxidation.

    Properties of EPM

    EPM is also referred to as ethylene propylene rubber or EPR. This material is a synthetic elastomer that is a close relative of EPDM rubber. This chemical has a variety of chemical and useful properties that make it incredibly useful in many industries. EPM does not fade or change color over time, it’s very robust and can resist oxidation, high and low temperatures, ozone, water exposure. Some forms of the material maintain flexibility even at extremely low temperatures up to -60°C. EPM does not conduct electricity due to the non-polar nature of its formula and it is not soluble in polar solvents. This material can be used at temperatures up to 130°C or 160°C when cured with peroxide. 

    This material is produced by combining propylene and ethylene monomers. The ratios of these monomers can vary, resulting in the production of rubbers with differing properties.


    Uses of EPM

    EPM has a variety of applications. For instance, the chemical is used in the production of motor oils, expansion joints, plastic and rubber products, including tubes, hoses, radiators, seals, etc. The material is also used to insulate high-voltage cables.


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    Mooney Viscosity, ML (1+4)100℃8-109-1113-182445-557540-50
    Ethylene Content, %45-4850,5-53,5 55-5950,351,3-54,357,855
    Volatility, %≤0,60≤0,60≤0,50≤0,60≤0,50≤0,75≤0,75
    Ash content, % ≤0,040,040,040,040,040,10,5
    Average molecular weight80000-1000009000090000110000-120000140000-150000180000 -190000120000
    Form of substancepiecepiecePressed granulespiecepiecepiecepiece
    Kinematic viscosity (100°С), mm²/s (10% solution)580610,52850-9001644,364300,564489,684100
    Shear stability index (SSI)23-242320-25≤33≤45≤5040-43
    Package25 kg polypropylene sack, 42 sacks in metal box (1050 kg)25 kg polypropylene sack, 42 sacks in metal box (1050 kg)25 kg polypropylene sack, 24 sacks in cardboard box (600 kg)25 kg polypropylene sack, 42 sacks in metal box (1050 kg)25 kg polypropylene sack, 42 sacks in metal box (1050 kg)25 kg polypropylene sack, 42 sacks in metal box (1050 kg)25 kg polypropylene sack, 42 sacks in metal box (1050 kg)