70 mm Blue Dot Quantitative Filter Paper Discs / Grade 391

These 70 mm diameter very slow filtering, blue dot filter paper discs are used for quantitative and gravimetric analyses as well as for pressure or vacuum filtration. They are made out of 100 % cotton linters with an α-cellulose content of > 98 % and are acid-washed to make the papers ashless and achieve high purity.