The FG/FL series PTFE pleated filter cartridges are made with high-strength polytetrafluoroethylene membranes and polypropylene skeleton, providing excellent filtration performance and long-term stability of filtration efficiency during use. The FG series, configured with hydrophobic membranes, can be directly used for filtering various low surface tension chemicals, while the FL series, configured with hydrophilic membranes, can filter various aqueous reagents without the need for pre-wetting. With enhanced chemical resistance, they are commonly used for the filtration of etching solutions, stripping solutions, and other active chemical liquids such as acids and alkalis in the panel new energy sector.