Spun-boned PP filter cartridges Coreless filter elements purely made of polypropylene by spun-bonded technology. Wound String Filter Cartridges Wound string filter cartridges are structured loose outer layers and tight layers which can offer true depth filtration for high dirt holding capacity and extremely and chemical 6. Core matenal:pofypropylene or stainless steel Membrane Pleated Filter Cartridges The filter cartridge has the charactenstics of excellent chemical compatibility, high flow rate, low pressure difference, long life, low pnce.wide filtration precision and it can be used in different 1. 100% pure polypropylene construction 2. Wide chemical compatibility 3. No lubricants or anti-static additives 4. Excellent dirt holding capacity 5. Consistent filtration over the life of the cartridges