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Kaopaque 20 Kaolin

White Non Plastic Delaminated Kaolin

Alternate Names: Kaopaque, Kaopaque Kaolin

OxideAnalysisFormula
CaO0.21%0.010
MgO0.03%0.002
K2O0.08%0.002
Na2O0.03%0.001
TiO20.66%0.021
Al2O339.30%1.000
SiO245.20%1.952
Fe2O30.32%0.005
LOI12.00
Oxide Weight222.76
Formula Weight253.14
If this formula is not unified correctly please contact us.

A white firing delaminated material of low plasticity. Kaopaque 20 and 10 are non-predispersed from a water-fractionated feed for a controlled particle size and shape (very large plate-like). It is refined from Geogia deposits.

Kaopaque 10S is the pre-dispersed version and is supplied as a lightly pulverized spray-dried powder and as a slurry. The large plate-like particles of Kaopaque 10 have a thickness of 0.2 to 0.4 microns and a diameter of 2 to 10 microns.

Kaopaque is useful in casting porcelains. It fires white compared to other North American kaolins, but others available internationally are whiter (e.g. New Zealand kaolin). Kaolins of higher iron content, like Opticast, also work well for slip casting and cost much less.

Kaopaque 20 has very high fired shrinkage (from 10-12% from cone 8-10), happening inspite of the fact that it is very refractory (15% porosity at cone 8, 10% at cone 10).


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By Tony Hansen

XML for Import into INSIGHT

<?xml version="1.0" encoding="UTF-8"?> <material name="Kaopaque 20 Kaolin" descrip="White Non Plastic Delaminated Kaolin" searchkey="Kaopaque, Kaopaque Kaolin" loi="0.00" casnumber="95077-05-7"> <oxides> <oxide symbol="CaO" name="Calcium Oxide, Calcia" status="" percent="0.210" tolerance=""/> <oxide symbol="MgO" name="Magnesium Oxide, Magnesia" status="" percent="0.030" tolerance=""/> <oxide symbol="K2O" name="Potassium Oxide" status="" percent="0.080" tolerance=""/> <oxide symbol="Na2O" name="Sodium Oxide, Soda" status="" percent="0.030" tolerance=""/> <oxide symbol="TiO2" name="Titanium Dioxide, Titania" status="" percent="0.660" tolerance=""/> <oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="39.300" tolerance=""/> <oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="45.200" tolerance=""/> <oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="" percent="0.320" tolerance=""/> </oxides> <volatiles> <volatile symbol="LOI" name="Loss on Ignition" percent="12.000" tolerance=""/> </volatiles> </material>


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