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PTFE - Hydrophobic membrane - For nonpolar liquids and gases. See the file Chemical compatibility below - Very resistant to all kinds of solvents as well as acids and bases; flushing with alcohol, followed by water, makes the originally hydrophobic membrane more hydrophilic - PTFE filters with integrated glass fiber prefilter* (GF / PTFE) are recommended for solutions with a high load of particulate matter or for highly viscous solutions H-PTFE - Hydrophlic membrane - For polar and nonpolar sample solutions - Resistant to all kinds of solvents as well as acids and bases. See the file Chemical compatibility below 3 mm filters for < 1 ml Sample Volume – Filtration Area 0.07 cm2 – Dead Volume 5 µl 13 mm filters for < 1-5 ml Sample Volume – Filtration Area 1.37 cm2 – Dead Volume 30 µl 25 mm filters for < 5-100 ml Sample Volume – Filtration Area 4.91 cm2 – Dead Volume 80 µl