REFSAN CALCITE
REFSAN CALCITE
RAW MATERIALS AND OXIDES

REFSAN CALCITE (8161)

Brand : REFSAN
Price : 15,24TL
ÇOKALAZÖDE BOYA

CALCITE

Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO3). The Mohs scale of mineral hardness, based on scratch hardness comparison, defines value 3 as "calcite"

Whiting has traditionally been a source of CaO in raw glazes and glass (however whitings also typically contain some dolomite as a contaminant). Whiting is generally inexpensive and there is a large calcium carbonate industry worldwide for non-ceramic uses of this mineral. Well-known deposits are the chalk cliffs of England, France, and Belgium. Marble and calcite ores are abundant in many places.

In glazes that contain both calcium carbonate and silica, it is preferable to source as much as possible of the SiO2 from wollastonite instead. This is because the SiO2 in wollastonite is taken into solution in the melt much more easily than from highly refractory quartz particles.

In low-fire bodies, calcium carbonate is sometimes added in small amounts as a filler to reduce fired shrinkage and act as a whitener. It is also common to see 5% whiting included in porous earthenware body recipes to prevent moisture expansion (which causes glazes to craze).