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EPDM is a copolymer of ethylene and propylene. Ethylenepropylene-diene rubber (EPDM) is produced using a third monomer and is particularly useful when sealing phosphate-ester hydraulic fluids and in brake systems that use fluids having a glycol base.

Both o-rings and gaskets can be made from EPDM materials.

Names: Ethylenepropylene-diene rubberEPDMEPREPM

Compound Info

ASTM D1418 DesignationEPDM
ASTM D2000/SAE J200 Type, ClassAA, BA, CA, DA
Hardness (Shore A)40-95

Thermal Properties

Standard Min Temp.-40°F (-40°C)
Max Temp.275°F (135°C)
Special Min Temp.-67°F (-55°C)
Special Max Temp.302°F (150°C)

Chemical Resistance

Hot water & steam up with special compounds up to 400°F (204°C)
Glycol based brake fluids up to 300°F (149°C) Many organic and inorganic acids
Cleaning agents, soda and potassium alkalis
Phosphate-ester based hydraulic fluids (HFD-R)
Silicone oil and grease
Many polar solvents (alcohols, ketones, esters)
Ozone, aging and weather resistant

NOT Compatible

Mineral oil products (oils, greases, and fuels)

Disclaimer: These are general guidelines only. All materials should be tested in your application.

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