The reinforcing materials for fiberglass (FRP) doors and windows consist primarily of glass fibers and related products, such as rovings and continuous filament mats. Unsaturated polyester resin is the most commonly used resin matrix. Profiles are primarily manufactured using the pultrusion process.
The profiles feature a hollow, multi-chambered structure that incorporates an air insulation layer. During assembly, corner joints are secured using a combination of adhesive bonding and mechanical fastening, while gaps are sealed with rubber gaskets and weatherstripping.
