Ahlstrom 238, 0.35 mm - 140 mm /30 min. This medium thick paper is recommended for general chromatography applications. Ideal for use as wicks in protein or nucleic acid blotting to provide a uniform flow of buffer through the gel to the transfer membrane in a blotting sandwich. This is our most widely used blotting paper. Also suited for electrophoresis and the separation of inorganic compounds and for use in removing gels from glass supports.