Laboratory Filters - T010A142C - Advantec Unsupported Hydrophobic PTFE Membranes, 0.1 um, 142 mm; 25/Pk -- GO-36229-82. Supplier: Cole-Parmer. Description: This thin, highly porous PTFE membrane is inert to most chemically aggressive solvents, strong acids, and bases that may be incompatible with supported PTFE filters.