Syringe Filters, PTFE, .45um. Tisch Scientific offers an extensive selection of proven, yet affordable syringe filters that are in stock and ready to ship today. Selected for their durability, material quality and performance characteristics, our syringe filters deliver accurate, measurable results at a fraction of the cost. Available in a wide variety of materials, diameters, and in sterile and non-sterile options, these syringe filters provide quick, excellent microfiltration for use in