Polypropylene (PP) meltblown filter cartridges use polypropylene with a density of approximately 0.91 g/cm³. The maximum continuous operating temperature (dry) is 90°C, the peak temperature is 100°C, the melting temperature is 162-176°C, and the limiting oxygen index (LOI) is 18. It exhibits strong chemical compatibility, with excellent resistance to acids, alkalis, and organic solvents. Its disadvantages include a relatively low maximum operating temperature and susceptibility to aging during oxidation.
The filter cartridge is made of thermally entangled polypropylene ultrafine fibers. The fibers randomly form a three-dimensional microporous structure, with a fiber fineness typically between 1-4 micrometers. The pore size is gradient-distributed along the filtrate flow direction, forming a gradually tightening structure with a loose outer layer and a denser inner layer.
Typical operating parameters include a filtration accuracy ranging from 0.5 μm to 100 μm, with some high-precision models reaching 70 nm. The operating temperature is typically below 80°C, the operating pressure differential is below 5 MPa, and the pH tolerance range is 1-13.