waterproof
A relative term indicating that a material has
been treated, i.e., sized, coated, impregnated,
etc., in such a manner as to increase its
resistance to the penetration of water. The basic
principle of waterproofing is that the presence of
the waterproofing chemical or other material in or
on a fibrous substance modifies the surface
tension between water and the substances of the
fiber. WATER
RESISTANCE is probably a better term to use
with respect to any of the materials used in book
and paper conservation. (17 )
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