Does this terra cotta clay have an LOI higher than kaolin? No.

Saturday 4th April 2015

These two samples demonstrate how different the LOI can be between different clays. The top one is mainly Redart (with a little bentonite and frit), it loses only 4% of its weight when fired to cone 02. The bottom one is New Zealand kaolin, it loses 14% when fired to the same temperature! The top one is vitrified, the bottom one will not vitrify for another 15 cones.

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Kaolin, LOI, Terra cotta

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