These quantitative ashless hardened filter papers are recommended for use where a high purity is required for quantitative analysis.

• Ash content is less than 0,01%
• Acid-washed to remove impurities

The 392 grade filter papers possess very slowly filtering and tight fibre matrix properties. These quantitative filter papers are made using pure cellulose with an alpha cellulose.

These are involved in the applications such as fine-grained precipitates such as barium sulphate, metastannic acid, cuprous oxide.