| VERMICULITE AND PERLITE | ||
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Vermiculite is a natural mineral that expands with the application of heat. The expansion process is called exfoliation and it is routinely accomplished in purpose-designed commercial furnaces. Vermiculite is formed by hydration of certain basaltic minerals.
Chemical formula- (MgFe,Al)3(Al,Si)4O10(OH)2•4H2O |
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| Perlite is an amorphous volcanic glass that has a relatively high water content, typically formed by the hydration of obsidian. It occurs naturally and has the unusual property of greatly expanding when heated sufficiently. | ||
| Typical analysis of perlite | ||
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* 70-75% silicon dioxide: SiO2 * 12-15% aluminium oxide: Al2O3 * 3-4% sodium oxide: Na2O * 3-5% potassium oxide: K2O * 0.5-2% iron oxide: Fe2O3 * 0.2-0.7% magnesium oxide: MgO * 0.5-1.5% calcium oxide: CaO * 3-5% loss on ignition (chemical / combined water) |
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