IIR
Butyl Rubber (IIR)
Butyl rubber is composed by copolymerizing isobutylene which is with small amount of isoprene. It is like EPDM possessing excellent resistance to chemical and polar fluid, outstanding electrical insulation and good ozone resistance. The special properties of butyl rubber are low gas and moisture permeability and high shock absorption. These properties have made butyl rubber the polymer choice in a variety of applications.
Cure system
Standard IIRs are sulfur-cured.
Other Common Variations
- IIRs can be formulated with only “white list” ingredients as specified in 21.CFR 177.2600 for use in applications where the elastomer will be in contact with food or beverages, ex. bottle top seal for alcohol or medical.
General Information
ASTM D 1418 Designation
IIR, CIIR, BIIR
Standard Color(s)
Black
ISO/DIN 1629 Designation
IIR, CIIR, BIIR
Hardness Range
50-80 Shore A
ASTM D2000 / SAE J 200 Codes
AA, BA
Relative Cost
Low
Service Temperatures
Standard Low Temperature
-55°C / -67°F
Special Compound Low Temperature
Standard High Temperature
100°C / 212°F
Special Compound High Temperature
Performs Well In...
- Alcohols
- Ketones
- Dilute acids and alkalis
- Silicone oils & greases
- Water and Steam
- Phosphate ester based hydraulic fluids - Skydrol®
- Ozone, aging & weathering
Doesn’t Perform Well In...
- Aliphatic & aromatic hydrocarbons
- Halogenated solvents
- Petroleum based oils & greases