Quantitative Filter Paper, Diameter 9 cm, Material Cellulose, Porosity Fast, Minimum Pore Size 21 micron, Maximum Pore Size 23 micron, Thickness 0.2 mm, Fluted No, Grade 541, For Use With Gas, Liquids, Overall Length Not Applicable, Overall Width Not Applicable, Standards FDA, Shape Disc, Package Quantity 100. This item has been restricted from sale in the following state (s): []