Precision Associates, Inc.
Precision Associates, Inc.
3800 North Washington Ave.
Minneapolis, MN 55412-2142
Toll Free: 1-800-394-6590
Local: +1 612-333-7464
Sales: +1 612-334-9190
Fax: 612-342-2417
Email: [email protected]
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Chlorobutyl (CIIR) and Isobutylene Isoprene (IIR) compounds provide superior gas permeation and excellent weather resistance. They are also useful for their energy absorption properties. Food grades are available.

Butyl rubbers do not provide good petroleum oil or fuel resistance and are not especially good at compression set resistance.

PAI offers Butyl compounds in a hardness range of 30 to 70 durometer. Black is the standard color, but some white compounds are available.
Butyl Image
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Item #

Nominal Durometer

ASTM Code

Color

Compound Features

RoHS Compliant

REACH Compliant

13301 N/A 30 N/A CIIR N/A Black N/A N/A true N/A true
13401 N/A 40 N/A CIIR N/A Black N/A General Purpose, AMS 3237 N/A true N/A true
13501 N/A 50 N/A CIIR N/A Black N/A General Purpose, MIL-PRF-1149 Type I Class 3 N/A true N/A true
13525 N/A 50 N/A CIIR N/A White N/A N/A true N/A true
13666 N/A 60 N/A IIR N/A Black N/A General Purpose, MIL-PRF-1149 Type II Class 3 N/A false N/A true
13668 N/A 65 N/A CIIR N/A Black N/A Conductive N/A true N/A true
13720 N/A 70 N/A CIIR N/A Black N/A Resistant to Compression Set and High Temperatures N/A false N/A true
13766 N/A 70 N/A IIR N/A Black N/A General Purpose N/A true N/A true
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