The filtration performance, application scenarios and service life of the pleated membrane filter cartridge mainly depend on the material selection. The materials of this type of filter element are mainly divided into the filtration medium and the auxiliary support material. The filtration medium is the core, while the auxiliary material ensures the structural stability of the folding filter element. Different material combinations determine the application range and performance advantages of the pleated membrane filter element.
The most common filtration medium material is polypropylene (PP), which has strong chemical stability, is resistant to acid and alkali corrosion, has a low cost, and does not cause adhesive pollution. It is widely used in food, medicine, water treatment and other fields and is the most cost-effective basic material. The filtration accuracy can cover 0.1μm to 60μm. Polyethersulfone (PES) is a representative of high-end materials, with high micropore opening rate, high temperature resistance, chemical corrosion resistance, and low protein adsorption, suitable for high-precision scenarios such as terminal sterilization in the pharmaceutical industry and ultra-pure water filtration in the electronics industry.
Polytetrafluoroethylene (PTFE) is divided into hydrophilic and hydrophobic types, both of which have extremely strong oxidation resistance and chemical resistance. The hydrophobic type is suitable for gas filtration, while the hydrophilic type can be used for the fine filtration of oxidizing liquids. In addition, nylon (NL) has high mechanical strength and stable hydrophilicity, making it suitable for organic solvent filtration. Stainless steel and ceramic materials are suitable for extreme conditions such as high temperature and strong corrosion, and can be backwashed and regenerated but have a higher cost.
The auxiliary materials are mostly polypropylene support parts and sealing parts, which are joined by hot melt welding to avoid secondary pollution. In summary, the material selection of the pp pleated filter cartridge needs to be combined with the working conditions, taking into account the filtration accuracy and cost. The reasonable application of different materials is the key to achieving efficient filtration.