Ethylene Propylene (EP, EPM, EPDM) O-Rings

Ethylene Propylene (EP, EPM, EPDM) O-Rings Material Description

Ethylene propylene diene monomer is also known as EPDM, the E stands for ethylene, P for propylene, D for Diene and M for monomer. The ethylene content is typically around 45% to 75% for the EPDM. Can be used in water and steam (up to 300°F), glycol based brake fluids, silicone-based break fluids, many organic and inorganic acids, cleaning agents, sodium and potassium alkalis, phosphate ester based hydraulic fluids, silicone oil and grease, alcohols, ketones, esters and ozone. Not compatible with mineral oil products like oils, greases and fuels.

Engineered Seal Products has the expertise and inventory for your ethylene propylene (EPDM) o-ring applications. For over 50 years, ESP has been the leading engineering, quality, and supply chain choice for both standard and custom sealing applications. A seal, no matter the application, has to do just that.

Also Know As:

Epsyn®, Nordel®, Epcar®, Keltan®, Royalene®, Polysar-EDM®

Ethylene Propylene (EP, EPM, EPDM) Advantages:

Compatible for applications that come in contact with:

  • Hot water and steam with special compounds
    • Broad temperature range from -70° F to 30° F
  • Gycol based and silicone-based brake fluids
  • Ozone, aging and weather resistance
  • Cleaning agents
  • Silicone oil and grease
  • Alcohols, ketones, esters
Ethylene Propylene (EP, EPM, EPDM) Disadvantages:

Incompatible for applications that come in contact with

  • Oils
  • Greases
  • Fuels

ESP Ethylene Propylene (EP, EPM, EPDM) O-Rings Compounds:

ESP Compound Number Datasheet Hardness (Shore A) Low Temp High Temp Color Recommended For
ESP-E8061 PDF 70 +- 5 -- -- Black FDA & 3A sanitary approved

Ethylene Propylene (EP, EPM, EPDM) Material Properties

Ethylene Propylene (EP, EPM, EPDM) Material Temperature Range:

Heat Resistance: Up to approximately 302°F (150°C)

Cold Flexibility: Down to approximately -70°F (-57°C).

Normal Recommended Temperature Range Normal recommended temperature range

Extended Temperature Range Extended Temperature Range for short term only

PDF O-Ring Temperature Range Chart

Abrasion Resistance Good/Excellent
Chemical Resistance Excellent
Cold Resistance Good/Excellent
Heat Resistance Good
Oil Resistance Poor
Ozone Resistance Excellent
Tensile Strength Good/Excellent
Water/Steam Resistance Excellent

Material properties & Temp ranges based on Parker o-Ring Handbook (ORD 5700) recommendations.

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ASTM Designation
Shelf Life
25 Years
Hardness (Shore A) Range
40 - 95

Temperature ranges will apply to the majority of media for which the material is potentially recommended. With some media however, the service temperature range may be significantly different. ALWAYS TEST UNDER ACUTAL SERVICE CONDITIONS.

ESP’s shelf life recommendation is based on the ARP 5316 standard and intended to be utilized by those organizations who do not already have specific recommendations for the control of elastomeric seals. It should be noted that the packaging of the elastomeric seals prior to assembly into a product is an integral part of the controlled storage procedure. It provides a positive means of product identity from the time of manufacture, to the time of assembly.