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ASTM
D 1418 Designations: EPM, EPDM
ASTM
D 2000, SAE J200 Type / Class: AA, BA, CA, DA
STANDARD
COLOR: Black
TRADE
NAMES:
• Buna EP® (Bayer Corp.)
• Keltan® (DSM Copolymer, Inc.)
• Nordel® (DuPont Dow Elastomers)
• Royalene® (Uniroyal, Inc.)
• Vistalon® (Exxon Chemicals)
RELATIVE
COST: Low
GENERAL
TEMPERATURE RANGE: -65° to +300° F
Ethylene
propylene is a copolymer of
ethylene and propylene (EPM), or, in some cases,
a terpolymer due
to the addition of a diene monomer (EPDM).
This additional diene monomer can be important because
it includes unsaturation to
facilitate sulfur crosslinking (see Figure
37).
In
use since 1961, ethylene propylene is primarily
valued for its outstanding resistance to Skydrol® and
other phosphate ester type hydraulic fluids (including
Pydraul® and Fyrquel®), as well as for
its typical temperature range (-65° to +300° F,
-54° to +149° C).
Ethylene
propylene is also known for its good resistance
to weathering thanks
to saturation within
its chemical backbone.
EPM
PERFORMS WELL IN:
• Alcohols
• Automotive brake
fluids
• Dilute acids & dilute
alkalis
• Ketones (MEK,
acetone)
• Silicone oils & greases
• Steam (up to
400° F, 204° C)
• Water
EPM
DOES NOT PERFORM WELL IN:
• Aliphatic & aromatic
hydrocarbons
• Di-ester based
lubricants
• Halogenated solvents
• Petroleum oils
MATERIAL
PROFILES MAIN PAGE
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