SPECIFICATION OF VERMICULITE
|
CHEMICAL
COMPOSITION |
| 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. |
PHYSICAL
COMPOSITION |
| 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. |
