Dupré Vermiculite Technical Data
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CRUDE VERMICULITE
Angle of Repose: Varies from 38o to 27o according to grade size.
Chemical Analysis:
Vermiculite is a naturally occurring mineral and it's exact composition
may vary from sample to sample. Typical ranges for major and minor
components of Dupré Vermiculite are shown below.
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Typical Ranges for Major Components |
Typical values for Minor components |
|
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 |
|
SiO2 =
38.0% - 40.0%
|
CaO =
2.0%
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| MgO = 24.5% - 27.0% | CO2 = 1.5% | |
| Al2O3 = 8.0% - 9.5% | TiO2 = 0.75% | |
| Fe2O3 = 5.0% - 6.0% | F = 0.6% | |
| K2O = 4.0% - 6.0% | CrO3 = 0.15% | |
| H2O = 8.0% - 10.0% | P2O5 = 0.06% | |
| Minor components circa 4.0% | Cl = 0.05% |
Melting Point: Collapse and
coalescence of the individual flakes begins at 1330ºC.
Specific Heat: 1.08 kJ/kg.K.
Specific Gravity: 2.5
Mohs Hardness: Between 1 and 2.
pH value: 8 to 9.5.
H2O loss: at 105ºC = 4.5 to 6.5%, at
950ºC = 8.0 to 10.0%
Aspect ratio: Typically, this varies
from 7:1 to 30:1 depending on grade but mechanical processing
can produce aspect ratios of 50:1
Cation exchange: The
exchangeable cation normally present in Vermiculite is
magnesium. The cation exchange capacity of
Dupré exfoliated Vermiculite is up to 600 milliequivalents per
kg.
CRUDE VERMICULITE
Crude Vermiculite consists of golden brown plates. A range of particle sizes is available with specific and detailed analysis.
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Particle Size Distribution 70% retained |
Loose Bulk Density (Kg/m3) |
|
| Large |
-8mm +3mm |
750 - 850 |
| Medium |
-4mm +1.4mm |
880 - 1000 |
| Fine | -2mm +0.71mm | 890 - 1000 |
| Superfine | -1mm + 0.355mm | 925 - 1050 |
| Micron | 0.71mm + 0.250mm | 925 - 1050 |
25kg sacks
1mT big bags