| Angle of Repose
|| This varies from 38º to 26º according to grade
| Melting Point
|| Collapse and coalescence of the individual flakes begins at 1330ºC
|| 1.03 kJ/kg.K. at 20ºC
1.05 kJ/kg.K. at 30ºC
| Specific Gravity
|| 2.5 to 2.6 depending on grade
| Mohs Hardness
|| Between 1 & 2
| pH Value
|| Crude Vermiculite: 8.5 to 10
|| At 105ºC - 4.5 to 6.5%
At 950ºC - 8.0 to 10.0%
Note: (a) At the lower temperature all the weight loss will be water. (b) At the higher temperature most of the weight loss will be water but some will be volatile components such as carbon dioxide.
|Aspect Ratio: Ratio of flake diameter to flake thickness
|| As received, this varies from 7:1 to 30:1 depending on grade.
Mechanical processing can produce aspect ratios of 50:1.
Chemical and mechanical processing can produce ratios of 200:1.
Note: The higher the aspect ratio the thinner the vermiculite flake.
|| The exchangeable cation normally present in vermiculite is Magnesium. The cation exchange capacity of Palabora Vermiculite is up to 600 milliequivalents per kg. The rate of cation exchange will depend on exposed surface area; therefore, the best results are obtained using exfoliated vermiculite.
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