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Initially, glass-reinforced polyester molding compounds were termed gunks, and their chief advantage was their ability to mold thick and thin sections in a single part. They were relatively wet, unsophisticated molding compounds. After considerable use and modifications their designation was changed to premix, which was. defined as an admixture of resin, reinforcement, fillers, etc., not in web form, usually prepared by the molder just before use (ASTM, 1964). The advantages of premix compounds were:
KeywordsPolyester Resin Molding Material Syntactic Foam Sohio Process Unsaturated Polyester Resin
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