Whatman* Hardened Low Ash Grades (Ash 0.015%)
Grade 50: 2.7 m
Retention of finest crystalline precipitates. The thinnest of all Whatman filter papers. Slow flow rate. This finish also keeps the paper free from loose surface fibers. Highly suitable for qualitative or quantitative filtrations requiring vacuum assistance on Buchner or three-piece filter funnels. Very strong when wet.
Grade 52: 7 m
General purpose hardened filter paper with medium retention and flow rate. Very hard surface.
Grade 54: 20 - 25 m
Very fast filtration for use with coarse and gelatinous precipitates. High wet strength makes this grade suitable for vacuum-assisted fast filtration of "difficult" coarse or gelatinous precipitates.
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Colonial Scientific has teamed up with the industry leaders, Fisher Scientific and VWR, and now offers their entire product line. Colonial Scientific provides any part from the Fisher Scientific site with a part number.
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