Developed by Coors Porcelain (now CoorsTek) of Golden, Colorado in the 1960s. More commonly known as High Alumina Ceramic, it is obtained when aluminum oxide crystals are heated until it forms a glassy texture. It is then bonded together with a nonporous body such as ceramic. Once sintered, it is a ceramic-bonding agent mixed with alumina particles (synthetic sapphires), shaped, then kiln fired at temperatures in excess of 3000 degrees F. First used in rod form by W.R. Case & Sons Cutlery Company which lead to the invention of the Crock Stick by Louis Graves, and the subsequent re-invention of the Sharpmaker by Spyderco’s founder, Sal Glesser.
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