WHA1441110
Whatman® quantitative filter paper, ashless, Grade 41
circles, diam. 110 mm, pack of 100
Recommended Products
material
circles
cotton filters (high-quality cotton linters)
packaging
pack of 100
manufacturer/tradename
Whatman 1441-110
Whatman Article No. 28418018 (US reference)
parameter
0.22 psi wet burst
54 sec/100 mL speed (Herzberg)
diam.
110 mm
thickness
220 μm
ash
≤0.007%
pore size
20-25 μm (Particle retention)
basis weight
85 g/m2
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General description
Ashless: 0.007% ash maximum for Grades 40 to 44 and a maximum of 0.01% for the 589 Grades - very pure filters suitable for a wide range of critical analytical filtration procedures.
Hardened low ash: 0.015% ash maximum - treated with a strong acid to remove trace metals and produce high wet strength and chemical resistance. These filters are particularly suitable for Büchner filtration where the tough smooth surface of the filter makes it easy to recover precipitates.
Hardened ashless: 0.006% ash maximum - acid hardened to give high wet strength and chemical resistance with extremely low ash content. The tough surface makes these filters suitable for a wide range of critical filtration procedures.
Grade 41: 20 μm (fast filter paper)
The fastest ashless filter paper, recommended for analytical procedures involving coarse particles or gelatinous precipitates (e.g., iron or aluminum hydroxides). Also used in quantitative air pollution analysis as a paper tape for impregnation when determining gaseous compounds at high flow rates.
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