- WHA1442042
WHA1442042
Whatman® quantitative filter paper, ashless, Grade 42
circles, diam. 42.5 mm, pack of 100
Recommended Products
material
circles
cotton filters (high-quality cotton linters)
embalagem
pack of 100
manufacturer/tradename
Whatman 1442-042
Whatman Article No. 28418038 (US reference)
parâmetro
0.40 psi wet burst
1870 sec/100 mL speed (Herzberg)
diâmetro
42.5 mm
espessura
200 μm
cinzas
≤0.007%
tamanho de poro
2.5 μm (Particle retention)
peso base
100 g/m2
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This Item | WHA1442055 | WHA1442240 | WHA1442047 |
|---|---|---|---|
| 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 1442-042, Whatman Article No. 28418038 (US reference) | manufacturer/tradename Whatman 1442-055, Whatman Article No. 28418040 (US reference) | manufacturer/tradename Whatman 1442-240, Whatman Article No. 28418048 (US reference) | manufacturer/tradename Whatman 1442-047, Whatman Article No. 28418039 (US reference) |
| parameter 0.40 psi wet burst, 1870 sec/100 mL speed (Herzberg) | parameter 0.40 psi wet burst, 1870 sec/100 mL speed (Herzberg) | parameter 0.40 psi wet burst, 1870 sec/100 mL speed (Herzberg) | parameter 0.40 psi wet burst, 1870 sec/100 mL speed (Herzberg) |
| diam. 42.5 mm | diam. 55 mm | diam. 240 mm | diam. 47 mm |
| pore size 2.5 μm (Particle retention) | pore size 2.5 μm (Particle retention) | pore size 2.5 μm (Particle retention) | pore size 2.5 μm (Particle retention) |
Descrição geral
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 42: 2.5 μm (slow filter paper)
A world standard for critical gravimetric analysis with the finest particle retention of all Whatman cellulose filter papers. Typical analytical precipitates include barium sulfate, metastannic acid, and finely precipitated calcium carbonate.
Outras notas
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