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Lightweight and high strength: The relative density is between 1.5 and 2.0, which is only 1/4 to 1/5 of carbon steel, but the tensile strength is close to or even exceeds carbon steel, and the specific strength can be compared with high-grade alloy steel. Therefore, it has excellent effects in aviation, rockets, world aircraft, high-pressure vessels, and other product applications that need to reduce deadweight. The tensile, bending and compression strengths of some epoxy FRP can reach more than 400Mpa.
Corrosion resistance: FRP is an excellent corrosion-resistant material, and has good resistance to the atmosphere, water, and normal concentrations of acids, alkalis, salts, and various oils and solvents. It has been applied to various aspects of chemical corrosion protection and is replacing carbon steel, stainless steel, wood, non-ferrous metals, etc.
Good electrical properties: It is an excellent insulating material used to make insulators. It can still maintain excellent dielectric properties under high frequencies. It has excellent microwave transmittance and has been widely used in radar antenna covers.
Excellent thermal properties: FRP has low thermal conductivity, which is 1.25~1.67kJ/(m·h·K) at room temperature, only 1/100~1/1000 of metal, and is an excellent thermal insulation material. Under instantaneous ultra-high temperature conditions, it is an ideal thermal protection and ablation-resistant material, which can protect the world's aircraft from high-speed airflow above 2000℃.
Good scalability:
(1) It can flexibly design various structural products according to needs to meet application requirements and make the product have good integrity.
(2) It can fully select materials to meet the performance of the product, such as: it can design corrosion-resistant, instantaneous high temperature-resistant, products with particularly high strength in a certain direction, good dielectric properties, etc.
Excellent processability:
(1) It can flexibly select the molding process according to the shape, technical requirements, use and quantity of the product.
(2) The process is simple and can be formed in one time, with outstanding economic effects, especially for products with complex shapes and small quantities that are difficult to form. Its process superiority is more outstanding.
Low elastic modulus: The elastic modulus of FRP is twice that of wood, but 10 times smaller than that of steel (E=2.1×105). Therefore, it is often felt to be insufficiently rigid and easy to deform in the product structure.
It can be made into a thin shell structure or a sandwich structure, and can also be supplemented by high modulus fibers or reinforcement ribs.
Poor long-term temperature resistance:
Generally, FRP cannot be used for a long time at high temperatures. The strength of general polyester FRP decreases significantly above 50°C, and is generally only used below 100°C; the strength of general epoxy FRP decreases significantly above 60°C. However, high-temperature resistant resins can be selected to make it possible to work at a temperature of 200~300°C for a long time.
Aging phenomenon:
Aging phenomenon is a common disadvantage of plastics, and FRP is no exception. It is easy to cause performance degradation under the influence of ultraviolet rays, wind, sand, rain, snow, chemical media, mechanical stress, etc.
Low shear strength:
The interlayer shear strength is borne by the resin, so it is very low. The interlayer bonding strength can be improved by selecting the process and using coupling agents. The most important thing is to avoid shearing between layers as much as possible during product design.
Yunbai Environment specializes in the production and sales of stainless steel chimneys, industrial chimneys, fiberglass chimneys and other products. The company has first-class technical strength and looks forward to cooperating with you. Free service hotline: 4000-118-339, website: www.szhuading.com
