Whatman™ Quantitative Filter Paper: Grade 40

Supports accurate analysis in applications sensitive to very low levels of background contamination. Whatman™ Quantitative Filter Paper: Grade 40 Circles are additionally useful in gravimetric analysis where ash content might affect weight measurements of combusted samples. Ashless grades are very pure filters suitable for a wide range of critical analytical filtration procedures. Whatman™ quantitative filter papers are designed for gravimetric analysis and the preparation of samples for instrumental analysis. High-purity filters for quantitative analysis Contain 0.007% maximum ash content Medium nominal particle retention rating of 8µm Medium filtration speed (Herzberg 340 sec.)