Adding reinforced steel in the profile cavity greatly improves the strength of the profile, and has the effects of shock resistance and wind erosion resistance. The addition of anti-ultraviolet components also improves the weather resistance of UPVC Profile Door & Window, and can be used with confidence even in tropical areas with strong ultraviolet rays. Good thermal insulation performance: The thermal conductivity of UPVC Profile Door & Window itself is far less than that of aluminum profiles, and the design of the multi-cavity structure achieves the effect of thermal insulation.