Fiberglass Window Screen  Fiberglass screening is woven from permanent glass yarn which has been coated with a protective vinyl to ensure lasting beauty, colour(black, gray) and flexibility. Fiberglass is noncombustible and will not rust, corrode or stain. Lightweight and economical, it comes in several different weaves and thread diameters.  It is also named: window screen, fiberglass net, mosquito netting, fly screen, invisible pvc coated wire mesh.fiberglass insect window.