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The Los Angeles Rubber Group, Inc Chemical Resistance of Elastomers

The following chemical resistance evaluation of various elastomers has been assembled by The Los Angeles Rubber Group,Inc based on the published literature of various polymer suppliers, rubber manufacturers and sources including:

Asahi Glass	Handbook of Plastics and Elastomers, Harper
Bayer	Hutchinson
Copolymer Rubber and Chemical Corporation	Malaysian Rubber Bureau
Cytec	Parker Seal Company
Dow Corning Corporation	Precision Rubber Products Corporation
DuPont Dow Elastomers	Thiokol Corporation
Dyneon	Uniroyal
Federal Mogul Corporation	Zeon Chemical
Goodyear Tire and Rubber Company

The criteria used for the ratings were primarily volume swell resistance, compression set resistance, and in addition, aging resistance. For the most part the ratings were arrived from specific data or general agreement of the above sources. When no data or agreement was found, the ratings were arrived at by theory and analogy. In some cases they are the considered opinion of experienced compounders. We cannot guarantee their accuracy nor assume responsibility for their use.

Several factors must always be considered when using a rubber part in service. The most important as we see them are:

a. The temperature of service. Higher temperatures increase the effect of all chemicals on polymers. The increase varies with the polymer and the chemical. A compound quite suitable at room temperature might fail miserably at elevated temperatures.

b. Conditions of service. A compound that swells badly might still function well as a static seal yet fail in a dynamic application.

c. The grade of polymer. Many types of polymers are available in different grades that vary greatly in chemical resistance.

d. The compound itself. Compounds designed for other outstanding properties may be poorer in performance in a chemical than one designed especially for fluid resistance

In light of these factors, it is always best to test.

Each polymer is rated for use in individual chemicals at room temperature. Where multiple chemicals are in use, refer to the rating of the most aggressive fluid when evaluating polymer performance. Polymers are rated as:

1. Recommended. Little or minor effect, 0-5% volume swell where applicable.

2. Minor to moderate effect. Rubber parts probably still useful in most applications, 5-10% volume swell where applicable.

3. Moderate to severe effect. Rubber parts useful in some static applications only. 10-20% volume swell where applicable.

4. Not recommended.

--- No data available or insufficient evidence.

TLARGI wishes to thank DuPont Dow Elastomers for their assistance in updating this chemical resistance guide.

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The Los Angeles Rubber Group, Inc Chemical Resistance of Elastomers