Butyl O-Rings » Isobutylene Orings and IIR O-Rings

Butyl is a synthetic rubber, a copolymer of isobutylene and isoprene. Butyl exhibits an extremely low gas permeability rating, making Butyl orings ideal seals in the military industry sealing gas mask and protective clothing. Butyl orings are also found in many other industries due to its diverse chemical resistance properties. Butyl o-rings are also referred to as isobutylene-isoprene orings or IIR o-rings. Columbia offers a complete selection of both the standard AS568 o-ring and metric o-ring sizes. Columbia can also develop custom Butyl o-rings to meet customer applications or specifications.

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Butyl Orings » Chemical Compatibility Overview

Butyl
Chemical Resistance
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Good
Fair
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Acids: See Compatibility Lookup   2    
Brake Fluids Glycol (Dot 3&4) 1      
Dilute Acids   2    
Dilute Alkalis   2    
Hot Water / Steam up to 250ºF 1      
Mineral Oil and Grease       4
Phosphate-ester Hydraulic Fluids 1      
Polar Solvents (Ketones) 1      
Polyglycol Based Hydraulic Fluids 1      
Salt Solutions 1      
Silicone Oils & Greases 1      
Steam up to 399ºF   2    
Steam 400ºF to 500ºF       4

Butyl Compound >» Chemical Compatibility Lookup

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*Due to the number of interacting forces, it is STRONGLY RECOMMENDED THAT YOUR ELASTOMER SELECTION BE RIGOROUSLY TESTED IN THE ACTUAL APPLICATION, performance assumptions must be checked so that you are certain that all variables have been carefully considered.

Butyl O-Rings » Physical Properties Overview

Butyl
Physical Properties
Very
Good
Good
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Abrasion Resistance     3  
Acid Resistance   2    
Chemical Resistance 1      
Cold Resistance   2    
Compression Set Resistance     3  
Dynamic Properties     3  
Electrical Properties   2    
Elongation   2    
Flame Resistance       4
Heat Resistance   2    
Impermeability 1      
Oil Resistance       4
Ozone Resistance   2    
Tear Resistance   2    
Tensile Strength   2    
Water / Steam Resistance   2    
Weather Resistance   2    
*The chemical compatibility and physical properties are listed as general characteristics of the butyl o-ring compound. Speciality compounds can be derived to enhance or modify the performance to meet o-ring's application needs.

Butyl Compound » Compound Attributes

Chemical Description Isobutylene Isoprene rubber
Abbreviations (ASTM 1418) IIR
ISO / DIN IIR
Other Trade Names IIR
ASTM D2000 Designations AA, BA, CA
Low Temperature Range -75°F / -59°C
High Temperature Range 250°F / 121°C
*The butyl o-ring compound attributes are used to outline the basic properties. Butyl o-ring attributes can be adjusted by modifying the basic compound.

Custom Butyl O-Rings

Butyl O-rings can be made in custom sizes to fit any application specific needs. Our engineering staff can review your application and design a solution that satisfies those requirements. You can find assistance with o-ring gland design here. You can find assistance with o-ring design here. To request a quote on your o-ring specifications please submit a RFQ here.

Standard AS568 Butyl O-Rings

All stocked butyl AS568 o-rings have three measurement types. First, a nominal inch reference, then actual inch sizes, and finally the metric size displayed in millimeters. Butyl o-rings are stocked and cataloged by their AS568 number. This number references the Aerospace Standard 568 (AS 568) which was published by the SAE (Society of Automotive Engineers). Each o-ring is assigned a dash number which correlates directly to an exact o-ring size. You may view a complete chart of these o-ring sizes here.

Standard Metric Butyl O-Rings

Butyl O-rings are available in several metric sizes. Butyl metric O-rings are cataloged by their cross section and inside diameter. Columbia references the metric butyl o-rings by the compound number and the cross section along with the inside diameter. You may view a complete chart of the metric o-ring sizes here.
O-ring Measurement Chart
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