The specific gravity is 1.8-2.1g/cm3, which is only a quarter of the steel. FRP pultrusion products are lightweight and high-strength; The tensile strength of pultruded profiles is 150~300MPa, and the bending strength is 200~300MPa. The retention rate of bending strength after 1000h artificial accelerated aging can reach 78%. 2. Low deformation rate: after 1000h artificial accelerated aging, the length change of FRP pultrusion profile is+0.03%, and the width change rate is -0.07%. Therefore, the geometric shape and size of the products made of the pultrusion profile can maintain long-term stability. 3. High hot deformation temperature: the hot deformation temperature of pultrusion profile is 186 ℃, which will not soften under high temperature and will not be brittle under - 60 ℃, ensuring normal use under various ambient temperatures. 4. Low water absorption: the water absorption of ordinary FRP products is less than 0.5%, while the water absorption of pultruded profiles is only 0.257%, which is suitable for use in harsh outdoor and humid environments. 5. Low thermal insulation coefficient: the thermal insulation coefficient of pultruded profile is close to that of hard PVC, and the thermal insulation coefficient of single frame double glass thermal insulation window made of pultruded profile is only 2.69W/(m2. K), while that of the same type window made of steel and aluminum is as high as 4.0W/(m2. K).