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Whatman Filter Paper No.42, Qualitative, Ashless

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Whatman Filter Paper No.42, Qualitative, Ashless

Filter Paper, No.42, Qualitative, Ashless

Description

General description
Whatman quantitative filters are designed for gravimetric analysis and the preparation of samples for instrumental analysis. They are available in three formats designed to meet your specific needs.

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.


Technical Specification
Brand Product code Diameter ( cm ) PACKING QTY
Whatman 144-2042 4.25 100/ Box
Whatman 144-2047 4.7 100/ Box
Whatman 144-2070 7.0 100/ Box
Whatman 144-2090 9.0 100/ Box
Whatman 144-2110 11.0 100/ Box
Whatman 144-2125 12.5 100/ Box
Whatman 144-2150 15.0 100/ Box
Whatman 144-2185 18.5 100/ Box
Whatman 144-2240 24.0 100/ Box
Whatman 144-2320 32.0 100/ Box