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CoorsTek® AD-99.5% alumina contoured mortar is glazed completely except for the inside grinding surface and the outside bottom 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.