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What's Difference Between FRP and SMC Manhole Cover

What's Difference Between FRP and SMC Manhole Cover

FRP and SMC manhole cover are new materials and those material is suit for environment situation. Despite SMC or FRP manhole cover, those features is different between iron manhole cover.

Today let's us introduce the difference between FRP and SMC manhole cover:

1.Fiberglass reinforced plastic (FRP) is also known as GFRP (GRP), ie, fiber reinforced plastic, and generally refers to a glass fiber reinforced unsaturated polyester, epoxy resin, and phenolic resin matrix.

The SMC material is an abbreviation of Sheet molding compound, which is a sheet molding compound. The main raw material consists of GF (special yarn), UP (unsaturated resin), low shrinkage additives, MD (filler) and various additives. Fiberglass reinforced plastic (FRP), also known as GRP, fiber reinforced plastic, generally refers to the use of glass fiber reinforced unsaturated polyester, epoxy resin and phenolic resin matrix.

Both SMC and FRP(GRP) are resin-based composites, but there are many differences:

*The material composition is different and the price is not the same: SMC raw materials are more than twice as expensive as FRP. (our company all use composite(smc or bmc) to produce manhole cover.)

*Molding process is not the same: SMC must use large hydraulic machinery, metal molds, after a high temperature and high pressure one-time hot pressure curing molding; traditional FRP process is the use of wood mold, artificial hand-paste method production, natural dry release molding.

*Product quality is not the same: SMC products are a material from the surface to the back, high temperature and high pressure heat curing molding, high density,  high strength, reliable quality; and FRP products are divided into layers of gel coat, glass fiber cloth, wood and other levels Depending on the quality of  the workers and the weather, the quality is not stable due to the hand lay-up process.

Conclusion: FRP is a general term for composites, and SMC is just one of the composites inside. Most of the former glass fiber reinforced hand lay-up, SMC is emerging from the use of mechanical molding.

SMC manhole coverSMC manhole cover

Those message from Zibo Best Energy-Saving Materials Co., Ltd. if you wanna know more details,please follow our website and welcome to inquiry.




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Contact: Elaine Yang

Whatsapp: +8613793332897

Email: sales04@coverchina.net

Add: No125 Liuquan Road Gaoxin District Zibo City,Shandong Province,China


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