- WHA1440125
WHA1440125
Whatman® quantitative filter paper, ashless, Grade 40
circles, diam. 125 mm, pack of 100
Recommended Products
material
circles
cotton filters (high-quality cotton linters)
packaging
pack of 100
manufacturer/tradename
Whatman 1440-125
Whatman Article No. 28417994 (US reference)
parameter
0.29 psi wet burst
340 sec/100 mL speed (Herzberg)
diam.
125 mm
thickness
210 μm
ash
≤0.007%
pore size
8 μm (Particle retention)
basis weight
95 g/m2
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This Item | WHA1444090 | WHA1444090 | WHA1443185 |
|---|---|---|---|
| material circles , cotton filters (high-quality cotton linters) | material circles , cotton filters (high-quality cotton linters) | material circles , cotton filters (high-quality cotton linters) | material circles , cotton filters (high-quality cotton linters) |
| packaging pack of 100 | packaging pack of 100 | packaging pack of 100 | packaging pack of 100 |
| manufacturer/tradename Whatman 1440-125, Whatman Article No. 28417994 (US reference) | manufacturer/tradename Whatman 1444-090, Whatman Article No. 28418064 (US reference) | manufacturer/tradename Whatman 1444-090, Whatman Article No. 28418064 (US reference) | manufacturer/tradename Whatman 1443-185, Whatman Article No. 28418061 (US reference) |
| parameter 0.29 psi wet burst, 340 sec/100 mL speed (Herzberg) | parameter 0.29 psi wet burst, 995 sec/100 mL speed (Herzberg) | parameter 0.29 psi wet burst, 995 sec/100 mL speed (Herzberg) | parameter 0.6 psi wet burst, 155 sec/100 mL speed (Herzberg) |
| diam. 125 mm | diam. 90 mm | diam. 90 mm | diam. 185 mm |
| pore size 8 μm (Particle retention) | pore size 3 μm (Particle retention) | pore size 3 μm (Particle retention) | pore size 16 μm (Particle retention) |
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
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Certificate of Origin
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