Sapphire Kaolin

Alternate Names: Saphire Kaolin, Saphhire Kaolin

Description: Secondary Fine Particle Kaolin

Oxide	Analysis	Formula
CaO	0.20%	0.01
K2O	0.19%	0.01
MgO	0.15%	0.01
Na2O	0.10%	-
TiO2	1.40%	0.05
Al2O3	38.15%	1.00
SiO2	46.25%	2.06
Fe2O3	0.65%	0.01
LOI	13.37%	n/a
Oxide Weight		232.85
Formula Weight		268.79

Notes

This is a secondary kaolin with a fine particle size distribution. It has no additives. It imparts high green strength while maintaining the best possible fired color. Sapphire is used in the dinnerware, artware and tile industries.

Physical Properties
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Dry M.O.R., psi:* 400
pH: 4.8
C.E.C., meq/100g: 6.5 +/- 1.0
Specific Surface Area, sq metre/g: 16.5
Specific Gravity: 2.6
P.C.E.: 33-34

Particle Size, Microns: 20 10 5 2 1 0.5 325# residue
(% finer than) 99% 97% 93% 81% 72% 56% .5

Fired Properties
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Color, Cone 8 (L) 83.0
(a) -0.8
(b) 8.6

Shrinkage Cone 10, 100% clay 9.2
Absorption Cone 10, 100% clay 7.8

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*Extruded, 50% ball clay, 50% flint
**50% Clay, 50% Nepheline Syenite

Related Information

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Materials	Kaolin The purest of all clays in nature. Kaolins are used in porcelains and stonewares to impart whiteness, in glazes to supply Al2O3 and to suspend slurries.
Typecodes	Kaolin Pure clay mineral, there are many brand names of varying purity and iron content.

By Tony Hansen
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