Metals and Minerals

Kaolin Powder

A white soft plastic clay composed of well-ordered kaolinite with a low iron content. It is made up of a loose aggregation of randomly oriented stacks of kaolinite flakes, smaller packets and sheaves, and individual flakes.

CHEMICAL ANALYSIS
SiO2 47.12 47.12 45.70 45.22
Al2O3 36.86 36.86 38.12 37.78
Fe2O3 0.66 0.28 0.40 0.44
CaO +MgO 0.31 0.16 0.16 0.43
TiO2 0.81 0.55 0.75 0.81
Na2O +K2 O 0.92 0.58 0.10 0.85
L.O.I 12.34 13.74 13.84 14.62
PHYSICAL PROPERTIES
Moisture w/w% (max) 3.0 3.0 2 2
pH 7 – 8 7 – 8 7.5 6
Suspension (% in 24 hours) Good Good 85 Good
>2 micron w/w% (min) 40 60 70 85
Water of Plasticity (ml/100gm) 32 28
Water Absorption (%) 30 14.2
+300 m retention w/w % >1.0 0.5 0.3 0.1
Green Shrinkage (%) 3.2 2.41
Fired Shrinkage (%) 7.8 12.2
Natural Gloss % (min) 83 90 85 85
Fired Gloss % (min) 87 96

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