Millipore LCR Hydrophilic PTFE syringe filters have excellent solvent resistance and are ideal for HPLC sample preparation. Millex® syringe filters are manufactured in a controlled environment for consistently reliable performance using an automated process. Human hands never touch the filter during assembly. A Certificate of Quality included in each box describes Millipore's quality standards in detail. Non-Sterile. Filter Material: Millipore MF Mixed Cellulose Esters membrane.