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gel
The initial jellylike solid phase that develops
during the formation of a resin from a liquid. A
semisolid system consisting of a network of solid
aggregates in which liquid is held.
gelation time
That interval of time, in connec-
tion with the use of synthetic thermosetting res-
ins, extending from the introduction of a catalyst
into a liquid adhesive system until the start of gel
formation. Also, the time under application of
load for a resin to reach a solid state.
gel coat
A quick setting resin applied to the sur-
face of a mold and gelled before lay-up. The gel
coat becomes an integral part of the finish lami-
nate, and is usually used to improve surface ap-
pearance and bonding.
glass finish
A material applied to the surface of
a glass reinforcement to improve the bond be-
tween the glass and the plastic resin matrix.
glass transition
The reversible change in an
amorphous polymer or in an amorphous regions
of a partially crystalline polymer from, or to, a
viscous or rubbery condition to, or from, a hard
to a relatively brittle one.
graphite
To crystalline allotropic form of car-
bon.
green strength
The ability of a material, while
not completely cured, set or sintered, to undergo
removal from the mold and handling without dis-
tortion
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