ASTM D2000 AA, BA
SAE J 200 Codes
Relative Cost Low
Automotive vibration control
Pharmaceutical industry: Closures for containers
Performs Well in…
Polar solvents, e.g. alcohols, ketones, esters
Dilute acids and Alkalis
Silicone oils & greases
Water and Steam
Phosphate ester based hydraulic
Fluids – Skydrol®
Ozone, aging & weathering
Doesn’t Perform Well in…
Petroleum based oils & greases
Aliphatic & aromatic hydrocarbons
Butyl is a common term used for the isobutylene isoprene elastomer. As the name implies, butyl is comprised of isobutylene with a small amount of isoprene. With outstanding low permeability to gases, Butyl is especially effective in vacuum sealing applications. Butyl is capable of providing high-energy absorption (dampening) and good tear strength. Butyl is like EPDM possessing excellent resistant to chemical and polar fluids, outstanding electrical insulation and good ozone resistance.
Low gas permeability
Good ozone and weather resistance
Good vibration damper
Because it is a petroleum product, Butyl has poor resistance to hydrocarbonsolvents and oils, and diester-based lubricants.
Butyl has an inferior high temperature limit when compared to EPDM andhas been largely replaced by Ethylene Propylene (EPDM).