Whatman Grade 40 Quantitative Ashless Filter Papers are high purity general purpose papers for quantitative analysis for a variety of analytical filtration applications. Grade 40 filters support accurate analysis in applications sensitive to very low levels of background contamination and in gravimetric analysis where ash content might affect weight measurements of combusted samples.
- High-purity filters contain 0.007% maximum ash content
- Medium nominal particle retention rating of 8 µm
- Medium filtration speed (Herzberg 340 s)
- Particularly useful for gravimetric analysis