EPDM / EPR (Ethylene-Propylene, EPM)

General Description:

Ethylene-Propylene based elastomers make up a family of synthetic rubbers characterized by excellent chemical and thermal resistance. These materials can be compounded in a variety of ways for use in a wide range of demanding applications. Ethylene-Propylene elastomers are most commonly available as EPR, a copolymer of ethylene and propylene, and EPDM, a terpolymer. EPR and EPDM have very similar properties and the abbreviations are often used interchangeably. EPDM can be cured with either Sulphur or Peroxide. Sulphur curing is less expensive and easier to process but the product may be tacky and can exhibit some bloom. Peroxide curing is more difficult to process but provides better chemical, thermal, and aging resistance.

Service Temperature Range*:

-65°F (–54°C) to 300°F (149°C)

*Approximation for dry air service. Actual temperature range of a compound in an end-use application is highly dependent on part type, hardware configuration, applied forces, chemical media, pressure and thermal cycling effects, and other factors. Consult a Marco Engineer for more details.

Typical Applications and Products:

EPDM is a versatile and relatively inexpensive material. It is often used in drinking water systems (NSF61, KTW, WRC/WRAS) due to its Chlorine and Chloramine resistance and in hydraulic and braking systems due to its excellent Glycol resistance. Other common uses include Medical and Pharmaceutical (USP class VI and ISO 10993) applications and Food and Dairy applications (NSF51 and USDA 3A). EPDM is available in o-rings, sheets, gaskets, custom molded products or extruded as solid or sponge. Hardness ranges from 40 Shore A to 90 Shore A. Special grades with military approvals are also available. EPDM has poor resistance and should not be used with most petroleum and mineral oil products. Specialty formulations with Y267 (L’Garde) cure are used in high temperature and pressure steam environments in geothermal applications.

Chemical resistance:

Not compatible with:

Compound and Product Options:

Not a complete list of offerings. Please contact a Marco Sales Consultant or Engineer to discuss additional options. See Popular Compounds list below for compound examples.

  • Internal Lubrication with PTFE and others
  • High strength
  • Flame resistant
  • ABS compatible
  • Anti-Static
  • WRAS, KTW and NSF Compliant
  • USP class VI and 3A approved
  • FDA compliant
  • Metal and X-ray detectable
  • Gamma Radiation Resistance
  • Tight and/or specific tolerances
  • Specific AQL Inspection requirement
  • Surface free of silicone oil
  • PTFE Coated in choice color
  • Special tumbling for complete flash removal
  • Talcum powder on surface to reduce sticking
  • Specific packaging requirements
  • Special bag and Label requirements
  • Variety of colors available

Popular Compounds:

Hundreds more specialty compounds available. Contact a Marco Sales Consultant or Engineer for more information.

Marco Compound Number Hardness
(Shore A)
Color Low Temp.
°F (°C)
High Temp.
°F (°C)


E1000 View Datasheet 70 Black -65 (-54) 300 (149)

Peroxide cured for improved aging, thermal and chemical stability. NSF61 complaint for drinking water applications and FDA compliant per 21 CFR 177.2600. Compare to Parker E1549-70 and Parco 5323-70.

E1005 View Datasheet 70 Black -65 (-54) 265 (129)

General purpose sulfur cured EPDM. Low cost compound with large stocked inventory. Alternative hardness and color options available. Compare to Parker E0603-70.

E1055 View Datasheet 70 Black -65 (-54) 300 (149)

General purpose peroxide cured for improved aging, thermal and chemical stability. High stocked inventory availability.

E1069 View Datasheet 70 Black -65 (-54) 260 (127)

NSF61 compliant for drinking water applications. Internally lubricated with Struktol.

E1071 View Datasheet 75 Black -45 (-43) 260 (127)

Conductive silver plated nickel filler for EMI / RFI shielding applications. Compare to Parker Chomerics E6434.

E1074 View Datasheet 70 Off-white -65 (-54) 300 (149)

USP Class VI, 3A-Dairy, USDA, and FDA compliant.

E1077 View Datasheet 75 Black -22 (-30) 212 (100)

Conductive nickel plated graphite filler for EMI / RFI shielding applications. Compare to Parker Chomerics E6306.

E1087 View Datasheet 80 Black -65 (-54) 300 (149)

Higher strength properties for improved service life in dynamic operation.

E1097 View Datasheet 70 Black -65 (-54) 300 (149)

Peroxide cured, NSF61, 3A-Dairy, USDA, and FDA compliant. Improved chloramine resistance.

E1100 View Datasheet 70 Tan -45 (-43) 300 (149)

Conductive silver plated aluminum filler for EMI / RFI shielding applications.

E1118 View Datasheet 75 Black -43 (-42) 300 (149)

Nuclear safe, improved radiation resistance, low extractables. Compare to James Walker Shieldseal 663.

E1121 View Datasheet 90 Black -50 (-46) 300 (149)*

Y267 cured for greatly improved steam resistance. High hardness compound with excellent Explosive Decompression (ED) resistance. Compare to Parker e0962-90.
*Steam resistance up to 600°F (315°C)

E1130 View Datasheet 70 Black -65 (-54) 300 (149)

NSF51 compliant for food contact.

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