Fiberglass Window Screen is rust and corrosion resistant, fireproof (at cigarette temperature), wont stretch or shrink and res Fiberglass Window Screen is rust and corrosion resistant, fireproof (at cigarette temperature), wont stretch or shrink and resists impact. Fiberglass Window Screen is also available in a variety of meshes and colors. Like aluminum, standard meshes are 18x16 and the two most popular colors are silver gray and charcoal. Fiberglass screening is also available in a fine-woven 20x20 mesh used primarily in coastal areas where very tiny flying insects (no-see-ums) are a problem. For large areas such as pool enclosures, a strong 18x14 mesh is also available. Some meshes and colors of fiberglass are also available on special order in 78" and 84" widths.