Titan3 Polypropylene Syringe Filter Housings Meet The Requirements of 21 CFR 177.1520. Membrane: HPLC Certified PTFE, with Polypropylene Support . Color. Transparent Blue. Description. 0.2 um, 30 mm, with Pre-Filter, 100 Pk. Diameter (Metric) 30 mm. Diameter (Metric) Membrane.