Pyrophyllite when heated at different temperatures, passes through several thermal transformation phases. One of the most critical transformations is the conversion into mullite at temperature above 1150°C.
Mullite features distinctive technical properties. These properties include low coefficient of expansion, low thermal conductivity and resistance to corrosion from molten metals. Thus, mullite is used as a refractory material and as a substitute for Feldspar and Silica in ceramic applications like floor and wall tiles and Sanitary ware. It has an L value of 90.
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