penta-chlorophenol ( p.c.p. )
A crystalline compound (C 6 C
15 OH), produced by the reaction of
hexachlorobenzene with sodium hydroxide, or of
chlorine with phenol, and used, in concentrations
of 0.1% by weight of the paper, as a fungicide. It
is applicable either as an aqueous or non-aqueous
solution. Being a highly chlorinated substance, it
must be used in the presence of sufficient alkali
to compensate for the probable liberation of
hydrochloric acid, or in such small quantities,
i.e., less than 0.1%, so as not to endanger the
paper severely even if it does decompose slightly.
To avoid the danger of acidity, p.c.p. is
sometimes used as the sodium salt, sodium
pentachlorophenate, which is less likely to
produce difficulty because of acidity. P.c.p. is
colorless and is not likely to produce an
appreciable odor. (198 )
![[CoOL]](/icons/sm_cool.gif){kind=icon}