Whatman 1442-042 Quantitative Filter Paper Circles, 2.5 Micron, Grade 42, 42.5mm Diameter (Pack of 100)
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<b>[Product Information]</b><br>
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<li>Diameter: 4.25cm</li>
<li>Retention: 2.5µm</li>
<li>A world standard for critical gravimetric analysis with the finest particle retention of all Whatman cellulose filter papers</li>
<li>A Whatman cellulose filter is manufactured from high quality cotton linters treated to achieve a minimum alpha  cellulose content of 98%</li>
<li>Typical analytical precipitates include barium sulphate, metastannic acid and finely precipitated calcium carbonate</li>
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