ECO - Epichlorohydrin Rubber


Epichlorohydrin rubber (ECO) has properties very similar to nitrile rubber but it has better heat and mineral oil resistance and improved low temperature flexibility. ECO’s possess also very low gas permeability, excellent ozone and weather resistance, good compression set and good heat and solvent resistance. Its resistance to acids, alkalis and ozone is also excellent.

However, epichlorohydrin rubbers are unsuitable for use with oxidizing agents, chlorine and many common polar solvents such as alcohols, esters, ketones, and phosphate ester-based hydraulic fluids. Some other limitations include poor electrical properties, low abrasion resistance and only moderate low-temperature flexibility.



Important manufacturers and suppliers of ECO rubbers are Zeon, and Osaka Soda.



Epichlorohydrin elastomers are widely used in the automotive industry for seals, hoses, gaskets, O-rings, cable jackets, and belts. ECO's are also an important ingredient of rubber glues. However, they are unsuitable for rubber to metal bonding because of their corrosiveness to metals.

The typical working temperature range is -35°C to +120°C (150°C short term).

Main Properties

Temp. Range, °C -35 / 120
Compression Set Fair
Strength Properties Fair
Low Temp. Prop. Good
Abrasion Resist. Poor/Fair
Gas Permeability Excellent
Weather Resist. Fair
Water Resistance Excellent
Ozone Resistance Excellent
Mineral Oil Resist. Excellent
Chemical Resist. Fair
Flame Resistance Good
Heat Resistance Good

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