Does this terra cotta clay have an LOI higher than kaolin? No.
Saturday 4th April 2015
These two samples demonstrate how different the insight-live.com/glossary/56">LOI can be between different clay minerals. 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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