An all-petroleum product, Butyl is a copolymer of isobutylene and isoprene and has largely been replaced by Ethylene Propylene since its introduction.
Key Uses: Highly effective in vacuum sealing applications. Good seal for hydraulic systems.
With outstanding low permeability to gases, Butyl is especially effective in vacuum sealing applications. It also features excellent resistance to ozone and sunlight aging. Butyl further features excellent shock dampening capabilities. Only slightly affected by oxygenated solvents and other polar liquids, Butyl is often utilized in seals for hydraulic systems using synthetic fluids. It is good with MEK, and silicone fluids and greases.
General specifications (actual specifications may vary)
ASTM D1418 Designation
- IIR
Standard Colour
- Black
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Because it is a petroleum product, Butyl has poor resistance to hydrocarbon solvents and oils and diester-based lubricants. Halogenated Butyl has been introduced to expand oil and chemical resistance to this polymer. Chlorobutyl and Bromobutyl have better resistance. These polymers have been accepted by the medical industry for stoppers and septum’s for pharmaceutical applications.