![Kyanite Grog 100 mesh](http://euclids.com/cdn/shop/products/MK004_2_{width}x.jpg?v=1619033275)
A fine grog added to clay bodies primarily to reduce stress from dry shrinkage. In clays fired above 1100º C, it fires off-white and begins to expand as it converts to mullite, effectively reducing the clay’s fired shrinkage.
With a little clay and sodium silicate, excellent refractory mortars can be made with kyanite.
For more information on kyanite, see the Digitalfire.com Reference Library of ceramic materials.