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 – Peroxide – Cured
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 Whre the elastomer will be in contact with food or beverages, ex. Bottle top seal for alcohol or medical.
Performs Well In…
►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
►Petroleum based oils & greases