IIR or Butyl Isobutylene Isoprene Rubber
- Abbreviation: IIR
- ASTM D-2000 Classification: AA, BA, CA
- Chemical Definition: Isobutylene Isoprene
Physical & Mechanical Properties
- Durometer or Hardness Range: 40 – 90 Shore A
- Tensile Strength Range: 500 – 3,000 PSI
- Elongation (Range %): 300% – 850%
- Abrasion Resistance: Fair to Good
- Adhesion to Metal: Good
- Adhesion to Rigid Materials: Fair to Good
- Compression Set: Fair to Good
- Flex Cracking Resistance: Good to Excellent
- Impact Resistance: Good
- Resilience / Rebound: Fair to Good
- Tear Resistance: Good
- Vibration Dampening: Excellent
Chemical Resistance
- Acids, Dilute: Good to Excellent
- Acids, Concentrated: Fair to Excellent
- Acids, Organic (Dilute): Good
- Acids, Organic (Concentrated): Fair to Good
- Acids, Inorganic: Good
- Alcohol’s: Good to Excellent
- Aldehydes: Good
- Alkalies, Dilute: Good to Excellent
- Alkalies, Concentrated: Good to Excellent
- Amines: Good
- Animal & Vegetable Oils: Good to Excellent
- Brake Fluids, Non-Petroleum Based: Good
- Diester Oils: Poor to Good
- Esters, Alkyl Phosphate: Good to Excellent
- Esters, Aryl Phosphate: Excellent
- Ethers: Poor to Fair
- Fuel, Aliphatic Hydrocarbon: Poor
- Fuel, Aromatic Hydrocarbon: Poor
- Fuel, Extended (Oxygenated): Poor
- Halogenated Solvents: Poor
- Hydrocarbon, Halogenated: Poor
- Ketones: Poor to Excellent
- Lacquer Solvents: Fair to Good
- LP Gases & Fuel Oils: Poor
- Mineral Oils: Poor
- Oil Resistance: Poor
- Petroleum Aromatic: Poor
- Petroleum Non-Aromatic: Poor
- Refrigerant Ammonia: Good
- Refrigerant Halofluorocarbons: R-12, R-13
- Refrigerant Halofluorocarbons w/ Oil: Poor
- Silicone Oil: Poor
- Solvent Resistance: Poor
Thermal Properties
- Low Temperature Range: -70º F to -40º F
- Minimum for Continuous Use (Static): -60º F
- Brittle Point: -90º F to -50° F
- High Temperature Range: +250º F to +300º F
- Maximum for Continuous Use (Static): +300º F
Environmental Performance
- Colorability: Good
- Flame Resistance: Poor
- Gas Permeability: Good
- Odor: Good
- Ozone Resistance: Excellent
- Oxidation Resistance: Excellent
- Radiation Resistance: Poor to Good
- Steam Resistance: Good to Excellent
- Sunlight Resistance: Excellent
- Taste Retention: Fair to Good
- Weather Resistance: Excellent
- Water Resistance: Good to Excellent
For assistance in identifying the appropriate polymer or material, or to develop and formulate an IIR / butyl rubber compound to meet your specific application and performance requirements, please contact Rahco Rubber, Inc. at sales@rahco-rubber.com or 847-298-4200.
Rahco Rubber, Inc. makes no expressed or implied warranty as to any qualities, attributes, or characteristics of any polymer or material. This information is provided for reference only.