In terms of very fine particle filters (pore sizes at about 0.2 micron), there seem to be some filters marketed/labeled to be for "air" (hence gases) and others for syringes (hence liquids)

To a layman as myself it is hard to see at a glance the necessary difference. What are those differencs?

One potential difference I have spoted so far is that as it was stated on http://omicronscientific.com/ the "air vent filter" is hydrophob, which I guess would make it impracticle for being used as liquid filter, when used with certain liquids.

There are filters used for gases

  • $\begingroup$ Beside wetability, being hydrophop or hydryophil, a liquid medium supposed to pass through the filter may differ quite a bit in terms of cohesion, compressibilty, and surface tension. As practical (?) example, imagine, your handkerchief wouldn't need to accomodate so much air (when honking), but -- with same velocity -- water: it had to be made of stronger material. In addition, syringe filters for liquids I know are designed either for pull, or push. $\endgroup$ – Buttonwood Feb 11 '19 at 20:06

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