Membrane: HPLC-Certified PVDF. Titan3 PVDF Syringe Filter 0.45 µm, 4 mm, 100 Pk. Titan3 PVDF Syringe Filter 0.2 µm, 4 mm, 100 Pk. Titan3 Polypropylene Syringe Filter Housings Meet The Requirements of 21 CFR 177.1520. Membrane: HPLC-Certified PVDF. Titan3 PVDF Syringe Filter 0.2 µm, 17 mm, with Pre-Filter, 200 Pk.