What's the difference? Fiberglass versus vinyl windows
from Bob Vila
Whether replacements for existing windows or part of new construction, your home’s “eyes” to the outside world involve quite a few decisions to find the right set. Chief among them is the material for the frame and sash of your windows. Currently, two of the most popular manmade materials for windows are vinyl and fiberglass. Vinyl is actually a truncation for polyvinyl chloride, a type of plastic. Fiberglass has a base of glass that’s melted under very high heat and then pulled into extremely fine fibers, which are woven together. If intended for solid construction, such as window frames, fiberglass is impregnated with various resins so it can be molded into shape.
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