Glass Fiber Reinforced Polyurethane (abbreviated as GRPU) is a high-performance composite material that uses non-woven glass fiber yarn as the reinforcement material and polyurethane resin as the matrix resin. It is produced through an injection impregnation pultrusion process. Due to its fiber reinforcement, it exhibits high compressive, tensile, and flexural strength. As national requirements for building energy efficiency continue to increase, this material—with its unique advantages such as sound insulation, thermal insulation, fire resistance, aging resistance, low linear expansion coefficient, energy efficiency, and environmental friendliness—has now made a breakthrough in the field of energy-efficient doors and windows.

In the application of doors and windows, polyurethane energy-saving auxiliary frames offer significant advantages compared to broken bridge aluminum alloy and plastic steel. Doors and windows made from this material excel in thermal insulation, wind resistance, air tightness, water tightness, sound insulation, fire resistance, and corrosion resistance. Additionally, the surface of the profiles can undergo various coating treatments, offering a wide range of aesthetic effects.