When comparing sterile vacuum filters, many people focus on pore size first. That is important, but membrane material can be just as important for the workflow.
PES and CA Are Different
Different membrane materials can behave differently depending on the liquid, method, and filtration goal. PES and CA membranes should not be treated as identical.
Consider the Sample Workflow
A 250mL sterile vacuum filter with a 0.22 micron PES membrane may be selected when moderate volume and finer filtration are both relevant.
Review Compatibility
Before using any membrane filter, lab users should confirm whether the material fits the liquid and downstream process.
Final Thoughts
A filter should be chosen as part of the complete lab method. Membrane material, pore size, and sample volume all need to work together.