The thermal expansion of the thermally expansive daylighting material directly affects the difficulty of construction, the construction cost, and the reflection of the waterproof performance after the project is completed. Therefore, in the roofing with coiled material and colored panels, the thermal expansion of lighting materials is the most important factor that should be considered in the design and construction. The thermal expansion coefficient of FRP daylighting sheet is 2.6×10-5cm/cm/℃ and the thermal expansion coefficient of color steel sheet is similar, the relative displacement caused by the change of cold and heat is less, and it is not easy to leak water due to deformation. The thermal expansion coefficient of the PC sun panel is 6.75×10-5cm/cm/℃, which is about 5 times that of the color steel sheet. The temperature difference on the color steel sheet roof varies greatly. The relative displacement of the PC sheet caused by thermal expansion and contraction is too large, causing Loose contacts or torn or deformed screw holes and water leakage. (The thermal expansion coefficient of color steel sheet is 1.25×10-5cm/cm/℃).
2. Compatibility FRP daylighting panels can be customized according to needs to completely match the section of the roof color steel sheet, and the cost is low, convenient and fast, and the customized cycle only needs 2 days. The PC sheetis mainly a flat panel, with few sections to choose from, which cannot match the roof color steel sheet very well, and the customization is expensive and time-consuming.
3. Construction cost and waterproofness. Because the FRP lighting sheet can be customized to completely match the cross-section according to the needs, only a small amount of self-tapping nails and silicone tape are required for installation, so the installation is convenient, fast, low cost, and good waterproof. Because of the PC sheet It is based on flat sheets. In order to overlap with color steel sheets, other auxiliary structures are needed. The color steel sheets on the roof are wave-shaped, which makes the joints difficult to handle. The construction cost is high, time-consuming and laborious. The maximum length can only be 6 meters. Therefore, the joints need to be treated with aluminum blanking, and the sub-purlins need to be added on the material, which increases the construction cost and complexity. In addition, due to the high thermal expansion coefficient, the expansion pre-expansion must be calculated during construction. Keep. So it is very easy to cause water leakage.
4. The light transmittance of the light-transmitting FRP daylighting sheet is 0-85%. Because a certain proportion of glass fiber and stainless steel glass door are added to the polyester, the light will be diffusely scattered when it passes through, and it will not be left on the ground. The light belt will not produce glare and can provide a good working environment. The PC sheet is made of pure resin with a light transmittance of 0-88%. When light passes through it, it will not be diffusely scattered, but will be refracted. The light will leave a clear light band on the ground. When people look up, they feel very dazzling and dazzling, and they feel uncomfortable when working.
5. Service life FRP daylighting sheet surface is covered with a 20-micron DuPont Melinex 301 anti-ultraviolet film, which can cut off more than 99% of ultraviolet rays and resist other corrosives, protect the substrate from damage, and make the daylighting sheet use The life span can reach at least 15 years, but can actually reach more than 20 years. PC sunshine sheet uses anti-ultraviolet additives in the resin to resist ultraviolet rays, but at the same time, the purity of the raw materials is reduced and the sheet performance is affected, so that the anti-ultraviolet performance can not be effective for a long time, and it is easy to age, turn yellow and become brittle.
6. Surface maintenance The surface of the FRP lighting sheet is covered with a nominal 20 micron polymer film, which does not carry static electricity, does not absorb dust, and can be washed with water or rain. It is easy to clean, keeps bright and clean for a long time, low maintenance cost, and cycle long. Due to the electrostatic adsorption characteristics of PC solar panels, it usually absorbs dust in the air, which will affect the transmittance and aesthetics after a long time. PC panels have poor resistance to acid and alkali and cannot be cleaned with conventional detergents. Clean water Also, the electrostatically adsorbed dust cannot be cleaned, and the maintenance cost is high.
7. Tear resistance and tensile strength FRP adopts the structure form of upper and lower membranes and glass fiber reinforced, so that it has good tear resistance and tensile strength. The tensile strength is 75. The particularity of the molecular structure of the PC sheet results in poor tear resistance and tensile strength, and it is easy to be pierced by metal burrs and leak water, and the periphery of the screw hole is also easy to be torn. The tensile strength is 63.
8. Transport performance FRP daylighting sheet has good rigidity, but general toughness and not easy to bend. The bending strength is 125. PC sunshine sheet has average rigidity, but very good toughness, excellent transportation and handling performance; it can be bent into various arcs at will. The bending strength is 96.
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Contact:
Charles Soon
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Email: sales05@frpexpert.com