Molochite
Highly Calcined Alumina Silicate
| DENS - Density (Specific Gravity) |
2.7 |
| HMOH - Hardness (Moh) |
7-8 |
| COLE - Co-efficient of Linear Expansion |
20-1000C: 44 X 10-4 |
| PCE - Pyrometric Cone Equivalent |
34-35, 1750-1770C |
Molochite is made by firing raw low-iron kaolin to very high temperatures to bring about maximum conversion of the clay crystal to crystalline mullite (usually 95%+). The latter has high mechanical stability and resistance to thermal shock.
Molochite is available in a wide range of sizes (from 8 to 325 mesh) and in dedusted form. It is a very uniform material. It can be used as a very white firing porcelain grog and aggregate material. However, its chief use is in the investment casting industry, where successive coats of increasingly coarser molochite slurry are applied onto wax models. After drying, the wax is melted out and the molten metal poured in.
Since molochite is used for mechanical purposes in most applications, its chemistry is not usually a consideration (although it will have the chemistry of a calcined kaolin of course).
Not to be confused with "malochite" or "malachite" which is a green copper mineral.
Out Bound Links
XML for Import into INSIGHT
<?xml version="1.0" encoding="UTF-8"?>
<material name="Molochite" descrip="Highly Calcined Alumina Silicate" searchkey="" loi="0.00" casnumber="">
<oxides>
<oxide symbol="CaO" name="Calcium Oxide, Calcia" status="" percent="0.060" tolerance=""/>
<oxide symbol="MgO" name="Magnesium Oxide, Magnesia" status="" percent="0.310" tolerance=""/>
<oxide symbol="K2O" name="Potassium Oxide" status="" percent="2.000" tolerance=""/>
<oxide symbol="Na2O" name="Sodium Oxide, Soda" status="" percent="0.100" tolerance=""/>
<oxide symbol="TiO2" name="Titanium Dioxide, Titania" status="" percent="0.070" tolerance=""/>
<oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="42.000" tolerance=""/>
<oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="54.500" tolerance=""/>
<oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="" percent="1.100" tolerance=""/>
</oxides>
</material> | 
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