The disadvantages of FRP

1. Low modulus of elasticity. The modulus of elasticity of FRP is twice as large as that of wood, but 10 times smaller than that of steel (E=2.1X106). Therefore, it often feels insufficient rigidity and easy to deform in product structure. It can be made into thin shell structure, sandwich structure, and can be remedied by high modulus fibers or reinforcing ribs.

2. The long-term temperature resistance is poor. Generally, Fiberglass Reinforced Plastic can not be used at high temperature for a long time. The strength of general purpose polyester decreases obviously when it is above 50°C. Generally, it is only used below 100° C. The strength of general purpose epoxy GRP decreases obviously when it is above 60°C. However, it is possible to choose high temperature resistant resins so that the long-term working temperature can be 200°C - 300°C.

3. Aging phenomenon. Aging is a common defect of plastics, and Fiberglass is no exception. Under the action of ultraviolet radiation, wind, sand, rain and snow, chemical media, mechanical stress and so on, it is easy to cause performance degradation.

4. Low interlaminar shear strength. Interlaminar shear strength is borne by resin, so it is very low. The bond strength between layers can be improved by selecting process and using coupling agent. The most important thing is to avoid shearing between layers in product design.



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