A pultrusion composite consists of reinforcing materials, a laminating resin that binds the composite together, possibly a surfacing mat to improve the composite surface appearance, chemical resistance and weather resistance, and a variety of ancillary materials such as pigments to impart color, accelerators to cure the laminating resin, internal release agents, inert fillers, etc. The reinforcing materials normally used are fiberglass continuous strand mats and continuous fiberglass rovings. In many foreign countries continuous strand mat is not available and low solubility chopped strand mats must be used instead. The laminating resin may be an unsaturated polyester resin, a vinyl ester resin, or an epoxy resin, but approximately 90% of all pultruded products currently use polyester resins. Figure 1.1 shows an exploded view of one type of pultrusion composite containing both continuous strand mat and roving reinforcements. This construction should be balanced (same composition above horizontal centerline as below) to prevent the cured part from twisting and warping. Unbalanced construction profiles sometimes are made for specific design reasons. Some pultruded products contain only roving as the reinforcement. These are known as rod or bar stock.
KeywordsElectrical Market Ultrahigh Molecular Weight Polyethylene Unsaturated Polyester Resin Coolant Spray Vinyl Ester Resin
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