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Where molten thermoplastic or liquid thermoset resin enters the cavity in a tool.

A partial cure of plastic resins; a semi-solid, jelly-like state similar to gelatin in consistency.

Gel Coat
A resin applied to the surface of a mold and gelled prior to lay-up. The gel coat becomes an integral part of the finished laminate, and is usually used to improve surface appearance and protect the laminate from the environment.

Gel Point
The stage at which a liquid begins to exhibit pseudoelastic properties. (This stage may be conveniently observed from the inflection point on a viscosity-time plot). Also, 'gel time.'
See also - Gel time

Gel Time
Time required to change a flowable liquid resin into a non-flowing gel.

Glass fiber-reinforced plastic, polymer or polyester.

Glass Cloth
Conventionally woven glass fiber material; certain lightweight glass fabrics are also called scrims.
See also - Scrim

Glass Content
Percentage of glass in the compound.

Glass Fiber
Reinforcing fiber made by drawing molten glass through bushings. The predominant reinforcement for polymer matrix composites, it is known for good strength, processability and low cost.

Glass Resin Ratio
The amount of glass by weight compared to the amount of resin by weight in a finished laminate or molding.

Glass Rich
An area of molded part that has an overabundance of glass reinforcement. The reinforcement may appear dry and unwet with the resin.

A visual defect in a fiber glass reinforced cured organic (usually corrosion resistant resin) panel. The defect appears as many small visible unwet or foreign substances; a salt and pepper effect. The defect is not visible before cure but appears at exotherm of the panel.

Graphite Fibers
This term is used interchangeably with carbon fibers throughout the industry.

Green Strength
The strength of a freshly molded part that hasn't completely cured.

Glass-reinforced plastic, polymer or polyester.

Gun Roving
A special type of roving reinforcement designed for use in a gun or chopper gun.