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 medium to slowly filtering and medium to 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 fast filtration of fine precipitates such as calcium oxalate, magnesium ammonium phosphate, coarser forms of barium sulphate.