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Mica Vermiculite Bentonite
Manganese Oxide Ammonium Sulphate Kaolin
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Basic elements in %
Silica SiO2 38.00-41.00%
Alumina Al2O3 7.00-10.00%
Oxide of Iron Fe2O3 8.0-11.00%
Titanium Oxide TiO2 0.35-0.95%
Lime CaO 1.00-3.00%
Magnesia MgO 10.50-12.50%
Potash K2O 2.50-4.00%
Phosphorous P2O5 0.01-0.40%
Cromium Cr2O3 0.02-0.25%
Sodium Na2O 2.00-3.50%
Flourine F 0.20-0.80%
Chlorine Cl 0.00-0.50%
The typical ranges shown above have been derived from recent analysis data from representative samples of raw vermiculite.
Density Raw Vermiculite : 22 to 40 kg/Cft
Expanded Vermiculite : 1.6 to 4.5 kg/Cft
Incombustibility Can be used upto 11000C
Sintering Temperature 12600 C
Melting Point 13000 C
Specific Gravity 2.2 to 2.7
Hardness 1.5 to 3 on M.O.H's scale
PH Value 7.0 (alkaline)
Expansion 10 to 20 times its original volume
Thermal Conductivity 0.053 to 0.056 at 700 C mean K Cal/m/hr/0C
Solubility Insoluble in water or organic solvent
Cation Exchange 90 to 100 milli equevalents as per 100 gms
Water absorption retained by Expanded Vermiculite per Cu Ft. 10 to 12 liters of water
Water vapour absorption in relation to humidity Raw: 2.6% by weight
Expanded: 1% by weight
NOTE: As Vermiculite is a natural mineral, the properties and composition of supplied material may vary slightly from the above.
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