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This was used to make vitrified pipe. These SHAB test-fired bars show it from cone 6 (top) down to cone 1. At cone 1 it has 3% porosity but above that it fires to almost porcelain density. This level of fired maturity in a clay that does not fire red is unusual. Alberta Clay products had sealed their sewer pipe using salt glaze for decades because their clays, obtained near Medicine Hat, were refractory and porous, even when fired at high temperatures. IXL discovered this low temperature light burning and plastic terra cotta near Elkwater, Alberta. It fired so vitreous that no glaze was needed!
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IXL 45D
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