EPDM O-Rings – Ethylene Propylene O-Rings, Washers, Gaskets and Seals

EPDM o-rings, or ethylene propylene o-rings, are a family of synthetic elastomers with lower cost steam and chemical resistance, particularly for applications involving solvents, acids and other mild chemicals. Marco Rubber has the world’s largest inventory network of EPDM o-rings and made on demand custom manufacturing often without tooling fees, so the EPDM o-rings you need are always available. Whether it’s for water systems, braking systems, medical, pharmaceutical, food or dairy use, you can count on Marco Rubber to deliver your o-rings fast and efficiently.

EPDM O-Rings
EPDM O-Rings

EPDM O-Rings Summary:

Ethylene-Propylene rubbers make up a family of synthetic elastomers characterized by excellent chemical and thermal resistance. EPDM materials are most commonly used in applications involving solvents, acids, and other aggressive chemicals. EPDM has very poor compatibility with most mineral and petroleum based oils and is seldom used in those applications.

Recommended Use Not Recommended For Mechanical Properties
Sunlight, Ozone,  Weathering
Hot Water and Steam
Auto / Aircraft Brake Fluids
Some Acids and Bases
Ketones and Alcohols
Plumbing
Petroleum Oils
Mineral Oils
Fuels
Good Wear Resistance
Good Comp. Set Resistance
Moderate Short-Term Resilience
Good Permeation Resistance

Popular EPDM O-Rings Compounds:

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

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

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.

70 Black -65 (-54) 300 (149)

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

70 Black -65 (-54) 260 (127)

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

75 Black -45 (-43) 260 (127)

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

70 Off-white -65 (-54) 300 (149)

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

75 Black -22 (-30) 212 (100)

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

80 Black -65 (-54) 300 (149)

Higher strength properties for improved service life in dynamic operation.

70 Black -65 (-54) 300 (149)

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

70 Tan -45 (-43) 300 (149)

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

75 Black -43 (-42) 300 (149)

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

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)

70 Black -65 (-54) 300 (149)

NSF51 compliant for food contact.

EPDM O-Rings Temperature Range:

The temperature ranges presented above are approximations for dry air service only and should not be used to determine design specifications or end-use temperature limits. 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. The most practical way of determining an end-use temperature range is testing in the actual application conditions. Consult a Marco Engineer for more details.

EPDM O-Rings Typical Applications and Products:

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.

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.

EPDM O-Rings Chemical Resistance and Compatibility:


EPDM O-Rings Not Compatible With:


EPDM O-Rings 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.


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Existing Customer Specialist: 800-775-6525 or repeat customers

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PO Box 1150
Seabrook, NH 03874

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