Talc is a phyllosilicate which imparts a wide range of functions to floor and wall tiles, sanitary-ware, tableware, refractories and technical ceramics. In traditional building ceramics (tiles and sanitary-ware), it is used essentially as a flux, enabling firing temperatures and cycles to be reduced. In refractory applications, chlorite-rich talcs are transformed into cordierite to improve thermal shock resistance. For steatite ceramics, microcrystalline talcs are the most appropriate. During firing, talc is transformed into enstatite, which possesses electroinsulating properties, while very low-iron-content talcs are particularly suitable for use in frit, engobe and glaze compositions.