Shop a large selection of Centrifugal Filter Devices products and learn more about Thermo Scientific750L Nonsterile Micro-Centrifugal Filters. PTFE Membrane; 0.2μm Pore Limited warranty period: Subject to all warranty requirements and exclusions set out in our Terms and Conditions of Sale, this product is warranted from the date we ship the product and for ninety (90) days thereafter.