Due to the hot sale of FRP grating products, the manufacturers of FRP grating are also mixed, and many companies use inferior raw materials in order to save costs.
So how to discern the quality of FRP grating? To judge the quality of a product, we must first start with the raw materials it uses, and then judge the finished product. Finally, practice is the only standard to test the truth. tells.
A. Selection of raw materials
The raw materials used for FRP grating are resin, FRP fiber wire, and filler calcium powder in a ratio of 1:1:1. High-quality FRP grating is made of high-quality resin: unsaturated phthalic resin 196, colorless and transparent . Low viscosity, low exotherm, low shrinkage, high speed curing, high speed compatibility, bright gloss. The produced FRP grating is flat and smooth, with good gloss, high strength and certain toughness. If you use inferior resin, it will be completely opposite. Inferior resin is turbid, high viscosity, high heat release, high shrinkage, relatively slow curing, and poor compatibility. The produced FRP grating is porous, easy to break, and poor in strength. Not tough.
In the FRP grating, it is the FRP fiber that can enhance the toughness of the grating. High-quality fiberglass fiber filaments such as alkali-free fiberglass filaments have higher strength than steel wires, have certain toughness, chemical stability, good weather resistance, hardly absorb water and do not burn in case of fire. Their high strength can also be used as tire cords. Under normal circumstances, for the grid, the fiberglass fiber wires are laid according to 8-9 layers, so the product strength is guaranteed. However, some manufacturers use high-alkali fiberglass as non-alkali fiber. The high-alkali fiber has low strength and poor water and alkali resistance.
B. Comparison of finished products
High-quality FRP grating products have no obvious cracks in appearance, less pores, bright and pure colors, good transparency, high toughness and strength, good surface finish, and long service life; while inferior FRP grating products have cracks in appearance, There are many pores, the color is not pure and the gloss is not enough. It also has a shorter service life.
C. Practice is the only standard time to test the truth and also the fairest judge
FRP grating will also reveal its true strength in the actual use process. The color of high-quality FRP grating will be slightly dim after several years of use, and the whole board is intact without obvious damage. According to the test of practice, after a few years of use, there will be obvious damage such as corrosion, fracture and pores, the board will not be so flat, the color will be seriously degraded, and the overall aging. Generally, the FRP grating will be used for 20 years, but it will be inferior after two years. The overall aging phenomenon of FRP grating will appear, so it will bring huge losses to customers.