Aniline point is the minimum
equilibrium solution temperature, generally
given in F although C is also used,
for equal volumes
of aniline and
oil. Aromatic compounds in
oils contribute to a low aniline point
which in turn
indicates that such an oil
will soften or swell
both natural and
most synthetic rubbers. Therefore to
insure minimum action
on rubber gaskets, seals, etc.,
oils with high aniline
points should be
selected. Solvent refined oils as
a rule
satisfy such requirements.
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