Glass fiber reinforced plastic (FRP fiber reinforced plastic) profiles are made of glass fiber and its products as reinforcing materials, unsaturated polyester resin as basic materials, and the profiles produced by pultrusion process are assembled into doors and windows. According to the industry, FRP doors and windows are expected to be the new material era of the "fifth generation" doors and windows.
FRP doors and windows have the following excellent characteristics:
Lightweight: The density of FRP profile is about 1.7, which is 4 ~ 5 times lighter than steel, but its strength is very high. Its tensile strength is 350 ~ 450 MPa, which is close to that of ordinary carbon steel, its bending strength is 388MPa, and its bending elastic modulus is 20900MPa, so it does not need to be reinforced by steel lining.
Energy-saving: The thermal conductivity of FRP profile is 0.39 W/m K, which is only 1/100 ~ 1/1000 of that of metal. It is an excellent thermal insulation material. In addition, the FRP profile has a hollow structure, and all gaps are sealed by rubber strips and tops, so the heat insulation effect is remarkable. After testing, the heat transfer coefficient K0 of glass fiber reinforced plastic casement windows (single frame and double glass windows) is 2.2W/(m2 k), which belongs to the national standard GB/T8484? Level 8 in 2002 standard; Heat transfer coefficient K0 of glass fiber reinforced plastic casement window (single frame and three glass windows) is 1.8W/(m2 k), which belongs to the national standard GB/T8484? Level 9 in 2002 standard; The heat transfer coefficient K0 of glass fiber reinforced plastic casement window (single frame, three glass windows, low-emissivity glass) is 1.3W/(m2 k), which belongs to the national standard GB/T8484? Level 10 in 2002 standard. Is it GB/T8484? Level 10 in 2002 standard.
Good sealing performance: During the assembly process of FRP doors and windows, the corner treatment adopts the process of gluing and screwing, at the same time, all gaps are sealed by rubber strip and wool tops, and with the special profile structure, the sealing performance is good. According to the national construction engineering quality supervision and inspection center, Beijing construction hardware plumbing product quality supervision and inspection station and Beijing construction engineering quality inspection center, the air tightness reaches the national standard GB/T7107? Level 5 in 2002 standard; The water tightness reaches the national standard GB/T7107? Level 3 in 2002 standard.
The effect of health, environmental protection and energy saving is remarkable: the test results of FRP door and window profiles meet GB6566? According to the index requirements of main building materials in 2001 《 Radionuclide Limits of Building Materials 》, the test result is 0.2, the internal exposure index is 0.2, and the external exposure index is 0.2.
Good sound insulation effect: According to the test of the National Construction Engineering Quality Supervision and Inspection Center, the sound insulation RW of "Fangyun" brand glass fiber reinforced plastic double-glass and triple-glass windows reached 36dB and 39dB respectively, and the sound insulation performance grade was Grade 4.
Corrosion resistance: FRP is an excellent corrosion-resistant material, which has good resistance to acid, alkali, salt, most organic substances, seawater and humidity, as well as the action of microorganisms. With this characteristic, it is especially suitable for rainy, humid and coastal areas, and places with corrosive media.
Good dimensional stability: The linear expansion coefficient of FRP profile is 7.3×10-6/℃, which is lower than that of steel and aluminum alloy and 1/15 of that of plastic. Therefore, FRP doors and windows have good dimensional stability, and the change of temperature will not affect the normal opening and closing function of doors and windows.
Good temperature resistance: FRP is a thermosetting plastic. After the resin is cross-linked, it forms a three-dimensional network molecular structure, which becomes insoluble and insoluble, and will not melt even when heated. The thermal deformation temperature of FRP profile is above 200℃, and it has good high temperature resistance. And the low temperature resistance is better.
Good insulation performance: FRP is a good insulation material. It is not affected by electromagnetic waves, does not reflect radio waves, has good microwave permeability, and can withstand high voltage without damage. Therefore, FRP doors and windows have special uses for temporary buildings in the field and buildings of communication systems.
Good shock absorption performance: the elastic modulus of FRP profile is 20,900, and the doors and windows made of it have high shock absorption frequency. The combination of resin and fiber interface in FRP has shock absorption and anti-seismic ability, which can avoid the early damage caused by the resonance of the structural members in the working state.
Rich colors: FRP profiles have high hardness, and can be coated with various paints to make doors and windows of various colors, so as to adapt to the facade effect of buildings of different styles and grades.