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Perlite

Expanded volcanic glass

OxideAnalysisFormula
CaO1.00%0.138
MgO0.50%0.096
K2O4.00%0.329
Na2O3.50%0.437
Al2O313.50%1.025
SiO272.50%9.341
Fe2O31.00%0.048
LOI4.00
Oxide Weight743.34
Formula Weight774.31
If this formula is not unified correctly please contact us.

Perlite is an aluminum potassium sodium silicate mineral of volcanic origin. It is available as a grey to white powder or granular material. In ceramics it is can be used as an aggregate material to improve drying properties, reduce the weight, or add texture to clay bodies for use in making large forms.

Perlite has a wide range of chemistries, the one shown here is an example. However the chemistry of this material is not normally a factor in the reason for its use.


Perlite in a grogged sculpture body

Perlite in a grogged sculpture body

This body is a plastic fireclay base having 13% 20/48 grog and 10% 65 mesh silica sand. But the texture is far coarser than one would expect. That is because it has 4 cubic feet of perlite per thousand pound batch. If desired the surface can be trowel smooth. This works well partly because the perlite particles are soft and easy to crush.

Out Bound Links


By Tony Hansen

XML for Import into INSIGHT

<?xml version="1.0" encoding="UTF-8"?> <material name="Perlite" descrip="Expanded volcanic glass" searchkey="" loi="0.00" casnumber="130885-09-5"> <oxides> <oxide symbol="CaO" name="Calcium Oxide, Calcia" status="" percent="1.000" tolerance=""/> <oxide symbol="MgO" name="Magnesium Oxide, Magnesia" status="" percent="0.500" tolerance=""/> <oxide symbol="K2O" name="Potassium Oxide" status="" percent="4.000" tolerance=""/> <oxide symbol="Na2O" name="Sodium Oxide, Soda" status="" percent="3.500" tolerance=""/> <oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="13.500" tolerance=""/> <oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="72.500" tolerance=""/> <oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="" percent="1.000" tolerance=""/> </oxides> <volatiles> <volatile symbol="LOI" name="Loss on Ignition" percent="4.000" tolerance=""/> </volatiles> </material>


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