Epichlorohydrin (CO, ECO, GECO)

- Sep 01, 2017-

General Information
ASTM D2000                           CH

SAE J 200 Codes 
Relative Cost                           Medium

-40°~125°C      Special Compound      -40°~135°C
-40°~257°F       Special Compound     -40°~257°F

Primary Uses

  • Automotive: Fuel pump diaphragms, hoses, motor mounts, boots, seals

  • General industrial use

  • Medical: Oxygen mask hoses

Performs Well in…

  •  Mineral oil and grease

  • LPG, fuels

  • Silicone oil and grease

  • Ozone and weathering

Doesn’t Perform Well in…

  • Ketones and esters

  • Aldehyedes

  • Aromatic and chlorinated hydrocarbon

  • Brake fluids

Epichlorohydrin is available in three types: the homopolymer (CO), the copolymer (ECO), and the terpolymer (GECO). Epichlorohydrin compounds are noted for their superior gas impermeability and physical properties over a wide temperature range while maintaining excellent resistance to petroleum oils. It is a good replacement to IIR when not only gas impermeability but also oil resistance is needed. It is also used in the petroleum industry where a little higher temperature capability than NBR is required.

Application Advantages

  • Resistant to ozone, weathering and oils

  • Good heat resistance

  • Very low permeability to gas


  • Compounds from this polymer can exhibit a corrosive nature and can be difficult to process in manufacturing.

  • Compression set is only “fair” at elevated temperatures (120° to 135°C, 250° to 275°F).

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