This CoorsTek® AD-99.5% alumina octagon-style mortar is glazed completely except for the inside grinding surface. AD-99.5% Alumina Mortars and Pestles are recommended for precise elemental analysis because they provide minimal sample contamination. AD-99.5% Alumina is an extremely hard (9 on Mohs scale), non-absorbent, wear-resistant material. CoorsTek® porcelain & ceramic labware has excellent thermal-shock resistance. Mortar Style: Octagon. Material: 99.5% Alumina. Top O.D.: 100mm. Height: 47mm. Capacity: 80mL. CoorsTek® #: 60370.