PTFE filter membranes are used in TefTEC cartridge filters that help to support layers and components. The HIMA retentive PTFE membrane offers superior hydrophobic and water intrusion resistance compared to PVDF or Polypropylene, while also being cost-effective for an all-fluorocarbon filtration alternative! With 100% Flushed with 18MΩ-cm DI water as well as integrity tested right off the bat during production; this product has it covered when you need protection against dirt & dust without any added weight on your power supply. To know more visit https://www.eastcoastfilter.com/ptfe-teflon-c254.html