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Pyrophyllite (Pyrax)

Pyrax is chemically similar to a clay, it is a hyrated aluminum silicate. But Pyrax has the appearance of a talc. Many properties of Pyrax are quite similar to talcs. Pyrax has a neutral pH and due to the presence of quartz, is highly abrasive.
Pyrax HS Used mainly in wall tile bodies, especially fast-fire. It lowers firing temperature; produces low moisture expansion bodies; increases thermal shock resistance; and greatly increases firing strength of vitreous bodies. It promotes the development of mullite when substituted for an equivalent amount of feldspar or quartz.

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