Elastomer Service Properties: IIR
Service temperature limits, chemical resistance ratings, mechanical properties, and cure data for engineering elastomers and rubber compounds
| elastomer | grade or variant | acid resistance | astm designation | chemical resistance notes | common name | compression set pct (%) | compression set temp C | compression set time hr | cure system | density g cm3 (g/cm3) | elongation at break pct (%) | fuel resistance | gas permeability | glass transition temp C (C) | hardness range shore a | max continuous temp C (C) | max peak temp C (C) | max service temp C (C) | min service temp C (C) | notes | oil resistance | ozone resistance | steam resistance | tensile strength mpa (MPa) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| IIR | BIIR | Excellent | AA, BA (ASTM D2000) | Same as CIIR; bromine functionality enables faster cure and better co-cure compatibility; slightly better adhesion to metals and fabrics | Bromobutyl Rubber | 25-50 | 100 | 22 | sulfur, resin, zinc oxide, or peroxide | 1.15-1.35 | 400-800 | Poor | Very Low | -70 | 35-95 | 130 | 150 | 130 | -50 | Brominated IIR (1.5-2.5 wt% Br); ASTM D1418 BIIR; fastest curing of butyl family; preferred for tire inner liners globally | Poor | Excellent | Good | 7-17 |
| IIR | CIIR | Excellent | AA, BA (ASTM D2000) | Same chemical resistance as IIR; improved compression set, heat, ozone, and flex fatigue vs standard IIR; can be co-cured with EPDM, NR, SBR | Chlorobutyl Rubber | 25-50 | 100 | 22 | sulfur, resin, zinc oxide, or peroxide | 1.15-1.35 | 400-800 | Poor | Very Low | -70 | 35-95 | 105 | 120 | 105 | -55 | Chlorinated IIR (1.1-1.3 wt% Cl); ASTM D1418 CIIR; faster cure than IIR; used in pharmaceutical closures, tire inner liners | Poor | Excellent | Good | 7-17 |
| IIR | general | Excellent | AA, BA, CA (ASTM D2000) | Excellent resistance to dilute/concentrated acids and alkalis, water to 100C, polar solvents; excellent ozone and weathering; extremely low gas permeability (10x lower than NR); poor resistance to mineral oils, gasoline, and aromatic hydrocarbons | Butyl Rubber (General) | 30-60 | 100 | 22 | sulfur or resin | 1.15-1.35 | 400-800 | Poor | Very Low | -70 | 40-90 | 120 | 150 | 120 | -50 | Copolymer of isobutylene (~98%) and isoprene (~2%); extremely low gas permeability; excellent vibration damping; poor compression set at elevated temperatures | Poor | Excellent | Good | 3.5-17 |
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