CANZ Glossary of Terms – Campbell Composites

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There are currently 7 technical terms in this directory beginning with the letter G.

GEL

Partial cure stage in plastics resins of a viscous, jelly-like state where liquid material starts to transform into solid.

GEL COAT

A surface coat of specialised polyester resin, either coloured or clear, providing a cosmetic enhancement and weatherability to a fibreglass laminate.

GEL TIME

The length of time from catalyzation to gel or “B” stage.

GELATION

The formation of a gel.

GLASS TRANSITION

Reversible change in an amorphous polymer between a viscous or rubbery condition and a hard, relatively brittle one.

GLASS TRANSITION TEMPERATURE (Tg)

Approximate temperature above which increased molecular mobility causes a material to become rubbery rather than brittle. The measure value of Tg can vary, depending on the test method. (A widely accepted method is Differential Scanning Colorimeter – DSC.)

GRP

Glass reinforced plastics. Generally based on polyester resin. See fibreglass or FRP.