Shimadzu High-grade Hydrophobic PTFE filter membrane material to ensure filtration effect. 13 mm diameter, 0.22 µm pore size 

(FTFE is printed on Filter)

The hydrophobic PTFE membrane is very resistant towards all kinds of solvents as well as acids and bases. Flushing with alcohol, followed by water, makes the originally hydrophobic membrane more hydrophilic. (FTFE imprint on filter)