Whatman Grade 3 is equivalent to the filter papers Schleicher & Schuell 3S/H and Munktell Munktell no. 2.
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Properties:
Medium-fast filtering
Filtration speed of 325 s/100 ml
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Grade 3 is twice as thick as Grade 1, but with finer particle retention and excellent dirt holding capacity, as more precipitates can be retained without blockages occurring. Grade 2: 6 µm