A guide to sterile filtration for pharmaceutical and biotechnology laboratories

Pore size for sterilizing-grade filtration

0.22 µm is the conventional benchmark for bacterial retention in sterile filtration workflows across pharma and biotech. Confirm this matches your specific method or compendial requirement rather than assuming it's universal.

Membrane material for biological compatibility

PES is common for cell culture media and biological buffers due to low protein binding and good aqueous compatibility. PVDF is another frequent choice, particularly where extractables and low protein binding both matter. See our material comparison for the full picture.

Sterile filter formats

Sterile bottle-top filters and sterile capsule filters are both common in pharma/biotech settings, chosen based on volume and workflow—see our vacuum filtration guide and capsule filter guide for the format-level decision.

Sterility is a process, not just a product spec

A sterile filter is one component of a sterile process—aseptic technique, a controlled environment, and sterile receiving vessels all still matter. Buying sterile product doesn't substitute for the rest of the process. See our sterile vs. non-sterile guide for this distinction.

Documentation for regulated work

For GMP or other regulated pharma/biotech work, request certificates of sterility, lot documentation, and any validation support available for the specific product and lot you're using—don't assume it's automatically on file without asking.