MUNKTELL filter paper no. 3hw These papers are made for general purpose filtration with a low ash so that they can be used for ordinary qualitative filtration work. Munktells range of general purpose filter papers are designed for a variety of applications with different basis weights and properties such as for instance surface structure. (Typical properties) Basis weight (g/m²) 65 Filtration time for distilled water (s) 20 Wet bursting strength (kPa) >40