**Unlocking the Advantages of Polyurethane Fiber-Reinforced Doors and Windows**
Driven by the "dual carbon" strategy, building energy conservation is advancing from structural design to material innovation in depth. Polyurethane composite materials, with their lightweight, high-strength, weather-resistant, and corrosion-resistant properties, have been widely used in high-end fields such as aviation and wind power. However, their potential in the field of building doors and windows has not been fully exploited for a long time. In response to the extreme climate characteristics of high temperature, high humidity, high salt content, and frequent typhoons in Hainan, the "Technical Standard for External Doors and Windows of Civil Buildings in Hainan Province" has set strict requirements for the performance of doors and windows: the wind pressure resistance must reach the highest national standard level (Grade 9), the corrosion resistance life must exceed 30 years, and an ultra-low energy consumption target must be achieved. Traditional aluminum alloy doors and windows, due to high carbon emissions, low insulation, and susceptibility to corrosion, have been unable to meet the demands. However, glass fiber reinforced polyurethane doors and windows have broken through the bottleneck with disruptive technology:
