These 70 mm diameter very slow filtering, purple dot filter paper discs are used for quantitative & 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. Also, Check out Advantec 49005020 Other Filters PAPER DISK 8MM 1000/PK
