The doors and windows fiberglass reinforced polyurethane composite materials are made of pultrusion technology. The main frame comprises unique aerospace composite material profiles and is filled with B1-grade polyurethane foam.
Its advantages include excellent thermal insulation performance, high strength, good fire resistance, stable size, low production energy consumption, and rich appearance. The heat transfer coefficient of the frame material has a U value ≤0.68W/(m²·K), the whole window can reach 0.5W/(m²·K).
It can still meet most of the requirements of passive house certification and is economical, which can appropriately reduce the incremental cost of passive houses.