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optiKast Kaolin

Large Particle Size Kaolin

Alternate Names: OptiCast

Oxide Weight227.46
Formula Weight263.47
If this formula is not unified correctly please contact us.
MORD - Modulus of Rupture - Dry 225 psi (50/50 clay/silica)
SAMG - Surface Area (m2/gm) 11.0
L5 - % < 5 microns 74.0
L5M - % < 0.5 microns 18.0
P325 - % Passing 325 Mesh Wet 94.0
L20M - % < 20 microns 94.0
L10M - % < 10 microns 85.0
L2M - % < 2 microns 55.0
L1M - % < 1 micron 37.0
pHPW - pH for dry powder 5.7

optiKast is a coarse-grained kaolin used primarily in ceramic casting applications. It has a very fast cast and exceptional deflocculation characteristics. Thus optiKasT is preferred in pressure casting systems.

Velvacast kaolin is no longer available, this is the recommended substitute. One concern with Velvacast was its dark fired color (compared to other common plastic kaolins). Opticast has higher iron and TiO2 contents, this could impact translucency in porcelains, for example. Thus you may need to fire tests and adjust other materials in the recipe if needed. We have done fired shrinkage, porosity, dry performance and plasticity comparison tests between these two materials Oct 2011 and they do appear very similar, Opticast is a little more plastic and does not appear to fire darker at cone 8 and 10.

Out Bound Links

By Tony Hansen

XML for Import into INSIGHT

<?xml version="1.0" encoding="UTF-8"?> <material name="optiKast Kaolin" descrip="Large Particle Size Kaolin" searchkey="OptiCast" loi="0.00" casnumber=""> <oxides> <oxide symbol="CaO" name="Calcium Oxide, Calcia" status="" percent="0.100" tolerance=""/> <oxide symbol="K2O" name="Potassium Oxide" status="" percent="0.100" tolerance=""/> <oxide symbol="Na2O" name="Sodium Oxide, Soda" status="" percent="0.100" tolerance=""/> <oxide symbol="TiO2" name="Titanium Dioxide, Titania" status="" percent="1.600" tolerance=""/> <oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="38.700" tolerance=""/> <oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="45.200" tolerance=""/> <oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="" percent="0.500" tolerance=""/> </oxides> <volatiles> <volatile symbol="C" name="Carbon" percent="0.030" tolerance=""/> <volatile symbol="LOI" name="Loss on Ignition" percent="13.600" tolerance=""/> <volatile symbol="SO3" name="Sulfur Trioxide" percent="0.040" tolerance=""/> </volatiles> </material>

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