WHA1440012
Whatman® quantitative filter paper, ashless, Grade 40
circles, diam. 12.7 mm, pack of 400
Synonym(s):
Whatman filter, Whatman paper, Z740403, filter papers, paper filter
About This Item
Recommended Products
material
circles
cotton filters (high-quality cotton linters)
packaging
pack of 400
manufacturer/tradename
Whatman 1440-012
Whatman Article No. 28417986 (US reference)
parameter
0.29 psi wet burst
340 sec/100 mL speed (Herzberg)
diam.
12.7 mm
thickness
210 μm
ash
≤0.007%
pore size
8 μm (Particle retention)
basis weight
95 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 40: 8 μm (medium flow filter paper)
The classic general purpose ashless filter paper with medium speed and retention. Typical applications include gravimetric analysis for numerous components in cements, clays, iron, and steel products; as a primary filter for separating solid matter from aqueous extracts in general soil analysis, quantitative determination of sediments in milk and as a pure analytical grade clean-up filter for solutions prior to AA spectrometry.
Also used as a high-purity filter in the collection of trace elements and radionuclides from the atmosphere.
Other Notes
Legal Information
Certificates of Analysis (COA)
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