Formula: Ca3(PO4)2 or 3CaO.P2O5
Alternate Names: Tri-Calcium Phos, Tribasic Calcium Phosphate, Synthetic Bone Ash, Calcium Orthophosphate
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|DENS - Density (Specific Gravity)||3.18|
|GSPT - Frit Softening Point||1670C|
CAS 8875-87-4, 7758-87-4
A white, odorless, tasteless very small particle size powder that is stable in air, insoluble in alchohol and very slightly soluble in water.
In ceramics it is used as a substitute for bone ash in glazes and bodies since its chemistry is similar.
However brand name materials do not match the theoretical chemistry here and they can have an LOI of up to 10%. Often Ca rather than CaO content is quoted. There are normally ppm amounts of heavy metals, arsenic, fluoride.
Glaze Opacifier - Opacity
Tricalcium phosphate has been used as an opacifier (to replace tin oxide) to give similar color, texture, and brilliance in leadless sanitaryware glazes above cone 8. Does not produce opacity at lower temperatures.
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