Nepheline Syenite

Nepheline Syenite – K₂O3Na₂O4Al₂O₃9SiO₂ (m.p. 2200^o F/1200^o C) is a soda feldspar used frequently in clay bodies and glazes. Its unique characteristic is: the molecular equivalence of K₂O and Na₂O is greater than a typical Soda or Potash feldspar in relation to the Silica content. It can be used in a clay body when lowering the maturing temperature of the body is required. In a glaze, it can reduce glaze defects such as crazing and increase the working range of a glazes cone 011-5.