Diameter: 9.0cm Retention: 2.5m A world standard for critical gravimetric analysis A Whatman cellulose filter is manufactured from high quality cotton linters treated to achieve a minimum alpha cellulose content of 98%Typical analytical precipitates include barium sulphate - metastannic acid and finely precipitated calcium carbonate Pack of 100 Manufacturer: Whatman/GE Healthcare Manufacturer Part No: 1442-090