H490 fired test bars. Top is cone 10R. Below that going downward: cone 10, 9, 8 oxidation. Thus, the oxidation red color only holds under cone 8. For reduction, the both fires almost black. By cone 10R, it is behind to blister and melt.
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|Plainsman Clays Ltd.|
702 Wood Street, Medicine Hat, Alberta T1A 1E9
Phone: 403-527-8535 FAX:403-527-7508