palstic 0.2um ptfe syringe filter on stock Millex® Syringe Filter Units, Sterile, 4/13/25mm - Sterile 4mm Millex filters, perfect for small sample sizes. 13mm Millex filters, for processing 10mL. 25mm Millex filters come in several membrane types suitable for filtration and venting purposes - Find MSDS or SDS, a COA, data sheets and more