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EPDM O-Rings

EPDM (Ethylene propylene) is a copolymer formed from ethylene and propylene (known as EPM), and in certain cases, it becomes a terpolymer with the inclusion of a diene monomer (EPDM). The presence of this diene monomer is significant as it introduces unsaturation to facilitate sulfur crosslinking.

EPDM (Ethylene propylene) has been in use since 1961, primarily appreciated for its exceptional resistance to hydraulic fluids like Skydrol® and other phosphate ester types (such as Pydraul® and Fyrquel®). Additionally, it is valued for its typical operating temperature range, which spans from -55 to +150°C.

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Description

ASTM D 1418 Designations: EPM, EPDM
ASTM D 2000, SAE J200 Type / Class: AA, BA, CA, DA
STANDARD COLOR: Black

Trade names:
• Buna EP® (LANXESS)
• Keltan® (LANXESS)
• Nordel® (DuPont)
• Vistalon® (ExxonMobil Chemicals)

Relative cost: Low
General temperature range: -55 to +150° c

EPM performs well in:
• Alcohols
• Automotive brake fluids
• Dilute acids & dilute alkalis
• Ketones (MEK, acetone)
• Silicone oils & greases
• Steam (up to 204° C)
• Water

EPM does not perform well in:
• Aliphatic & aromatic hydrocarbons
• Di-ester based lubricants
• Halogenated solvents
• Petroleum oils

Material Selection Guide
MATERIAL NR SBR NBR CR EPDM HNBR ACM CSM SILICONE FKM (VITON)
HARDNESS RANGE (SHORE A) 40-90 35-90 40-90 40-80 40-90 40-90 40-80 40-80 30-80 50-90
HIGH TEMP oC 100 120 130 130 150 150 180 150 230 225
LOW TEMP oC -50 -55 -45 -40 -50 -45 -25 -40 -60 -15
STEAM F F F P G G P E E E
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E= EXCELLENT; G= GOOD; F= Fair; P= Poor; A=Available, NA= Not Available This guide is intended for general reference Only. The materials listed are the most commonly used. There are numerous compound variations designed for specific applications for which please forward details to our engineers for recommendation.

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