SiC — Extremely refractory material used to form kiln shelves. Highly resistant to corrosive atmospheres, and therefore suitable for salt, soda, and wood firing. Silicon carbide kiln shelves conduct electricity and should never be used in electric kilns. Occasionally used in powdered form as local reducing agent in oxidation firings, used in very small quantities for localized reduction of copper reds—larger amounts for frothing glazes. Toxic in inhalation. Source: Clay: A Studio Handbook

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