The manufacturing characteristics, properties, uses, and future possibilities of zircon porcelain are discussed. Any of the usua1 manufacturing processes may be used, but special glazes must be employed because zircon absorbs normal glazes: The typical properties (approximate values) are (a ) linear expansion, 4.5 × 10 ‐6 per °C., (b ) thermal conductivity, 0.012 (normal porcelain, 0.004 ...