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Quantitative (ashless) paper filters are made from 100 % cotton linters and are free from impurities since the paper is acid washed and cleaned with ultra pure water. The ash content is 0.008 %. Available as sheets and plain circles. Applications - Environmental analysis - Gravimetric analysis Metal content in Advantec filters, µg/g |Si|Na|K|Ca|Mg|Fe|Pb|Cu|Mn|Ni|Al|Zn|Cd| |:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---| |32|<10|<2|<10|<1|>8|<1|<1|<0,5|<1|2|<1|<0.5| Filters are available in many different standard sizes. Special cuts available on request - Just send an inquiry Comparison table with different quantitative filter papers.