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Pultrusion is a fabrication process to produce lineal profiles, that brings high performance Space-Age Composites within the reach of Window and Door Manufacturers.
Continuous fiberglass reinforcements, in roving and mat forms, are drawn through a resin impregnation station to coat each fiber with a specially formulated Thermosetting Resin mixture. The coated fibers are assembled by forming-shaping guide and drawn (pulled) through a die, where under pressure and heat the resins are cured. The result is a high strength profile, ready for use as it leaves the Pultrusion Machine. The process is irreversible, it can not be melted or reformed, unlike PVC, which under heat, will deform.
The resin used in Fiberglass Pultrusions is Thermoset vs. PVC (vinyl) which use Thermoplastic Resins. In the pultrusion process, under heat and pressure, the Thermoset Resins and Fiberglass form a new inert material that is impervious to temperature. Pultruded Fiberglass physical properties do not change through the full temperature cycle up to 350 F.
PVC resins become unstable at 155 F.
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