Glass fiber winding yarn is primarily used as electrical insulation material, industrial filtration material, and as anti-corrosion, moisture-proof, thermal insulation, soundproofing, and vibration-damping materials. It can also serve as a reinforcing material for manufacturing reinforced plastics, reinforced rubber, reinforced plaster, and reinforced cement products.

Fiberglass is primarily used as electrical insulation material, industrial filtration material, and as anti-corrosion, moisture-proof, thermal insulation, noise-proof, and shock-absorbing materials. It can also serve as reinforcing material for manufacturing reinforced plastics, reinforced rubbers, reinforced石膏, and reinforced cement products. Coating fiberglass with organic materials enhances its flexibility, making it suitable for packaging fabrics, window screening, wallpaper, coverings, protective clothing, and electrical insulation and noise-proof materials. As a reinforcing material, fiberglass has the following characteristics, which make its application far more widespread than other types of fibers and its development rapid. These features are as follows: (1) High tensile strength with minimal elongation (3%). (2) High elastic modulus, good rigidity. (3) Large elongation within the elastic limit and high tensile strength, thus absorbing a significant amount of impact energy. (4) Inorganic fiber with non-flammability and excellent chemical resistance. (5) Low water absorption. (6) Good dimensional stability and heat resistance. (7) Excellent workability, available in various forms such as strands, ropes, felts, and fabrics. (8) Transparent and allows light transmission. (9) Surface treatments developed for good adhesion with resins. (10) Affordable price. (11) Non-flammable, capable of melting into glass-like beads at high temperatures.