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Butyl
- Butyl Rubber
Typical
Trade Names:
- Bucar
Butyl - Columbian Carbon Co.
- Exxon
Butyl - Exxon Chemical Co. USA
- Polysar
Butyl - Polysar, Ltd.
Butyl
rubber is an all petroleum product made by co-polymerizing isobutylene
and just enough isoprene to obtain the desired degree of unsaturation
necessary for vulcanization. Brominated and chlorinated butyl
rubber are also available and are prepared by select replacement
of hydrogen with bromine or chlorine.
Until
the introduction of ethylene propylene rubber, butyl was the only
elastomer which was satisfactory for Skydrol 500 service over
a temperature range of -65 to +225 degrees F (-54 to +107 degrees
C).
In
addition, butyl has excellent resistance to gas permeation which
makes it particularly useful for vacuum applications, and accounts
for its wide use in the manufacture of inner tubes and the inside
layer of tubeless tires.
Butyl
is recommended for:
- Phosphate
ester type hydraulic fluids (Skydrol, Fyrquel, Pydraul)
- Keton
(MEK, Acetone)
- Silicone
fluids and greases
Butyl
is not recommended for:
- Petroleum
oils
- Di-ester
base lubricants
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