Among many functions of FRP grids, acid and alkali resistance and corrosion resistance are the most outstanding features. And for some occasions with high corrosiveness, such as chemical plants, there are many corrosive gases, liquids and other organic solvents, so the demand for grilles is higher than that of other factories. Generally, the minimum requirement of grids used in chemical plants is 3.8 cm thick. If the requirement is not met, 5.0 cm thick grids or 6.0 cm grids can be selected. 2.5 cm thick grille panels used in community walkways, garden walkways and factory staircase pedals are seldom used in chemical plants. Since grilles are mainly used as operating channels in chemical plants, it is necessary for safety to meet demand.