50MM PTFE MAIN APPLICATION: Naturally hydrophobic PTFE membrane provides the best chemical resistance, and can be used forventing applications or filtering gases , individually wrapped filters. 50MM PTFE MAIN FEATURES: 100% integritytested , sterile, and certified nonpyrogenic and noncytotoxic. VARIETIES CHOICES OF ALLPURE: Material: NYLON,PES, HPPTFE, PTFE, PVDF, CA, MCE, RC; Diameter: 25mm, 13mm; Pore size: 0.22um, 0.45um. Can meet your different demand for laboratory /Industrial