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Advantages and Disadvantages of Frp Materials

Oct. 26, 2020

Distributors For FRP Tanks will introduce you the advantages and disadvantages of FRP products.

1. Advantages of FRP

(1) FRP (lightweight and high strength)

The relative density is between 1.5 and 2.0, which is only 1/4 to 1/5 of that of carbon steel, but the tensile strength is close to or even higher than that of carbon steel, and the specific strength can be compared with high-grade alloy steel. Therefore, it has excellent results in aviation, rockets, space vehicles, high-pressure vessels, and other products that need to reduce their own weight. The tensile, flexural and compressive strengths of some epoxy FRP can reach more than 400Mpa.

(2) FRP has good corrosion resistance

FRP is a good corrosion-resistant material, and it has good resistance to atmosphere, water and general concentrations of acids, alkalis, salts, and a variety of oils and solvents. It has been applied to all aspects of chemical corrosion protection, and is replacing carbon steel, stainless steel, wood, non-ferrous metals, etc.

(3) FRP has good electrical properties

It is an excellent insulating material used to make insulators. It can still protect good dielectric properties under high frequency. It has good microwave permeability and has been widely used in radomes.

(4) Good thermal performance of FRP

FRP has low thermal conductivity, 1.25~1.67kJ/(m·h·K) at room temperature, which is only 1/100~1/1000 of that of metal. It is an excellent thermal insulation material. It is an ideal thermal protection and ablation resistant material in the instantaneous ultra-high temperature situation, and can protect the spacecraft from the erosion of high-speed airflow above 2000 ℃.

(5) FRP (FRP) can be designed well

① Various structural products can be flexibly designed according to needs to meet the requirements of use, and the products can have a good integrity.

②Materials can be fully selected to meet the performance of the product. For example, it can be designed to be corrosion-resistant, resistant to instantaneous high temperature, the product has particularly high strength in a certain direction, and has good dielectric properties.

(6) Excellent workmanship

①The molding process can be flexibly selected according to the shape, technical requirements, use and quantity of the product.

②The process is simple, it can be formed at one time, and the economic effect is outstanding, especially for products with complex shapes and small quantities that are not easy to form.

Frp Pressure Vessels

Frp Pressure Vessels

2. The shortcomings of FRP

(1) Low elastic modulus of FRP

The elastic modulus of FRP is twice that of wood, but 10 times smaller than that of steel (E=2.1×106). Therefore, the product structure often feels insufficient rigidity and is easy to deform. It can be made into a thin shell structure, a sandwich structure, or made up of high modulus fibers or reinforcement ribs.

(2) FRP has poor long-term temperature resistance

Generally, FRP cannot be used for a long time at high temperature. The strength of general-purpose polyester FRP decreases significantly above 50°C, and generally only used below 100°C; general-purpose epoxy FRP has a significant decrease in strength above 60°C. But you can choose high temperature resistant resin, so that the long-term working temperature is 200~300℃ is possible.

(3) Aging phenomenon of FRP

Aging phenomenon is a common defect of plastics, and FRP is no exception. Under the action of ultraviolet rays, wind, rain, snow, chemical media, and mechanical stress, it is easy to cause performance degradation.

(4) Low interlayer shear strength of FRP

The interlaminar shear strength is borne by the resin, so it is very low. The bonding force between layers can be improved by selecting processes and using coupling agents. The most important thing is to avoid shearing between layers as much as possible during product design.

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