The process of manufacturing fiberglass is called pultrusion because of its fabrication process to produce lineal profiles. The pultrustion involves pulling a collection of fibers in the form of rowing, tow, mat or fabric through a resin bath and then through a heated die to cure the resin. Fiberglass is irreversible, it cannot be reformed or melted like PVC. Fiberglass is a strong durable material perfect for window material which is subject to daily wear and tear from the environment.

Example of fiberglass roving
The manufacturing process works as follows:
Continuous strands of fiberglass roving and fiberglass mats are impregnated with resin, then drawn though a steel die which sets the shape of the stock. A portion of the die is heated to initiate the cure. The end product is a thermoset Fiberglass Composite. Very high strengths are possible due to high glass concentration and orientation of Fiberglass rovings and mats parallel and perpendicular to the length of the material being drawn through the die.
Thermoset (Fiberglass) & Thermoplastic (PVC/Vinyl):
Thermoset: (Fiberglass) Heat is generally used to cause a chemical reaction which sets the shape of the part permanently. Once the materials are cured they cannot be reformed: the process is irreversible. All fiberglass Products are thermoset.
Thermoplastic: (PVC/Vinyl) Heat is used to melt or soften a material during the forming operation. The shape is retained after the part is cooled below the softening point. The shape is not permanent since heating will soften the material and allow it to flow. The process is reversible. Products primarily made of plastics are thermoplastic. PVC is a thermoplastic material.
Pultrusion-The fabrication process to produce lineal profiles. Pultrusion process: Continuous strands of glass are saturated in a thermoset resin and pass through a heated die They are pulled through the die rather than pushed or extruded through the die-hence the term pultrusion. Pultruded Fiberglass has proven to be a superior material in five ways: dimensional stability, thermal insulation, durability and aesthetics, and environmental friendliness.
Manufacturing process:
The Fiberglass is pultruded (pulled) as compared to protruded (pushed) through a die. Benefit of this process are: no greenhouse gases are released during productions which contributes to a cleaner environment and a durable material that is irreversible.
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