Expanded volcanic glass

Chemistry %

CaO	1.00
MgO	0.50
K2O	4.00
Na2O	3.50
Al2O3	13.50
SiO2	72.50
Fe2O3	1.00

Volatiles %

LOI

4.00

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 often 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.

Out Bound Links

(URLs) Perlite at Wikipedia
http://en.wikipedia.org/wiki/Perlite

(Hazards) Perlite
The hazards of this material in the ceramic indust...

(Typecodes) 1: GNM - Generic Material

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Digitalfire Ceramic Materials Database

Perlite