A composition containing 100 parts by mass of a siloxane compound having
--HSiRO-- (wherein R is a hydrogen atom, a hydrocarbon group having 1 to
8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms or a phenoxy
group) and 0.0001 to 1 part by mass of at least one phenol compound of
general formula (1) or (2) as a stabilizer. ##STR00001## wherein a and b
are each an integer of 0 to 4; m is 0 or 1; p and q are each 1 or 2;
R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are each an alkyl group having 1
to 4 carbon atoms; X.sup.1 and X.sup.2 each represent an alkyl group
having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms or
a halogen atom; Y is an alkanediyl group having 1 to 4 carbon atoms; and
a plurality of R.sup.1s, R.sup.2s, R.sup.3s, R.sup.4s, X.sup.1s, X.sup.2s
or Ys, where present per molecule, may be the same or different.
