How to find the right Inline Lab Filters AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Inline Lab Filters
- Hydrophobic vs hydrophilic membrane
- Use hydrophobic PTFE for gas, air and vent lines, and hydrophilic PES, PVDF or nylon for liquids. A hydrophilic filter on a vent wets out and blocks airflow, while a hydrophobic filter will not pass aqueous liquid without prewetting.
- Connection type and size
- Match the inlet and outlet to your system (luer lock, hose barb sized to the tubing inner diameter, or threaded or sanitary fittings). A mismatched barb leaks or blows off under pressure.
- Pore size for the job
- Use 0.2 µm for sterilizing gas or liquid lines, and coarser prefilters ahead of it for particulate-heavy streams. Putting the sterilizing membrane first on a dirty stream clogs it quickly.
- Pressure, temperature and flow rating
- Your line pressure and temperature must stay below the device's stated maximums, and the filter area must be sized for the required flow. Undersized filters drop pressure excessively, and overpressured housings can burst.
- Sterilization compatibility
- Confirm whether the filter is autoclavable or gamma-irradiated if it goes into a sterile assembly. Some housings deform or lose integrity when autoclaved.
Brands that matter
- Pall: Acro vent filters and capsule filters for gas and liquid lines.
- MilliporeSigma: Millex-FG hydrophobic vent filters and Millipak and Opticap capsules.
- Sartorius: Midisart in-line gas and vent filters.
- Cytiva (Whatman): Polycap capsules and Polydisc in-line disc filters.
What to avoid
- Hydrophilic filters on gas vents or incubator and bioreactor air lines.
- Guessing barb size without measuring the tubing inner diameter.
- Running a sterilizing-grade filter without a prefilter on turbid liquids.