PROPERTY |
ASTM TEST |
UNIT |
LGWS |
|
DGWS |
|
|
|
|
|
|
Density |
Archimedes’s principle |
g/cm³ |
2.66 |
|
2.79 |
method |
|
|
|
|
|
|
Porosity (25 to 600 deg C) |
Open |
% |
4.82 |
|
2.79 |
Water Absorbtion |
SANS497:2011 standard |
% |
1.79 |
|
0.93 |
|
|
|
|
|
|
Specific Gravity |
Mintek |
- |
|
2.76-2.85 |
Softening Temperature (@ normal |
- |
oC |
|
1600 |
pressure) |
|
|
|
|
|
|
|
|
|
|
|
|
Linear Coefficient of: Thermal Expansion |
- |
Per◦C |
|
|
|
|
|
|
|
25 deg C to 100 deg C |
- |
|
|
2.9 x 10⁻⁶ |
25 deg C to 600 deg C |
- |
|
|
3.6 x 10⁻⁶ |
|
|
|
|
|
|
Specific heat capacity |
- |
J/kg.deg C |
|
|
|
Pyrophyllite – 25 o C |
- |
25 deg C |
|
1220 |
Pyrophyllite – 500 o C |
- |
500 deg C |
|
1306 |
|
|
|
|
|
|
Energy Density |
- |
kJ/m³.deg C |
|
|
|
Pyrophyllite – 25 o C |
- |
25 deg C |
|
3420 |
Pyrophyllite – 500 o C |
- |
500 deg C |
|
3655 |
|
|
|
|
|
Colour(Air fired) |
- |
- |
|
Pinkish |
Safe operating temperature (Continous |
- |
deg C |
|
1100 |
heat @ normal pressure) |
|
|
|
|
|
|
|
|
|
|
|
|
Thermal Conductivity (Approx values) |
- |
[ W/mK ] |
|
|
|
Unfired |
|
|
|
1,5 |
Fired to 900 deg C |
|
|
|
1.67 |
Fired to 1200 deg C |
|
|
|
2,5 |
|
|
|
|
|
|
TYPICAL MECHANICAL PROPERTIES
PROPERTY |
ASTM TEST |
UNIT |
LGWS |
|
DGWS |
|
|
|
|
|
|
Hardness |
Rockwell |
Rockwell |
40.020 |
|
60.96 |
|
Hardness test |
|
|
|
|
|
HR15T. |
Rockwell HV |
41.400 |
|
62.20 |
|
|
Rockwell HRF |
30.080 |
|
55.96 |
Hardness after firing to 1300 deg C |
- |
Moh's Scale |
6.000 |
|
6.00 |
|
|
Flexural Strength |
Cermalab |
Mpa |
25.000 |
|
38.20 |
isostatically pressed,fired to 800 deg C |
|
Mpa |
8.400 |
|
10.30 |
|
|
|
isostatically pressed,fired to 1300 o C |
|
Mpa |
14.300 |
|
28.10 |
|
|
|
Uniaxial Compressive Strength (UCS) |
UCS |
Mpa |
93.700 |
|
114.90 |
isostatically pressed,fired to 800 deg C |
|
|
82.000 |
|
84.80 |
|
|
|
|
isostatically pressed,fired to 1300 o C |
|
|
86.600 |
|
141.60 |
|
|
|
|
Young Modulus (E) |
UCM |
Gpa |
20.300 |
|
42.02 |
Poisson’s Ratio (ν) |
UCM |
v |
0.160 |
|
0.32 |
Strengthening parameter (ẞ ) |
|
|
3.640 |
|
3.79 |
Cohession (Co) MPa |
|
Mpa |
17.400 |
|
26.80 |
Friction angle (ɸ) |
|
|
34.700 |
|
35.60 |
|
|
|
|
|
|
Tensile Strength |
Cermalab |
Mpa |
1.300 |
|
1.40 |
isostatically pressed,fired to 800 deg C |
|
|
1.300 |
|
1.40 |
isostatically pressed,fired to 1300 o C |
|
|
1.200 |
|
1.40 |
|
|
|
|
|
|
Resistance to Impact |
D667-42T |
inch- lbs |
3.30 |
|
(6.35 mm rod or 1/4 ") |
|
|
|
|
|
Thermal shock resistance |
|
|
|
|
|
isostatically pressed,fired to 1000 deg C |
Cermalab |
_ |
Excellent |
|
Excellent |
|
|
|
|
|
|
|
|
|
|
|
TYPICAL ELECTRICAL PROPERTIES
PROPERTY |
ASTM TEST NUMBER |
UNITS |
WONDERSTONE |
|
|
|
|
|
Dielectric strength |
D667-42T |
Volts per mil |
100.000 |
|
(Step 60 cycles) |
|
|
|
|
|
|
|
Dielectric Constant (Relative Permittivity) |
D667-42T |
|
|
60 cycles |
|
|
- |
|
|
|
1 |
MHz |
|
|
5.300 |
|
|
|
10 |
MC |
|
|
5.300 |
|
|
|
100 MC |
|
|
5.200 |
|
|
|
|
|
|
|
Power Factor |
D667-42T |
|
|
60 cycles |
|
|
- |
|
|
|
1 |
MC |
|
|
0.010 |
|
|
|
10 |
MC |
|
|
0.009 |
|
|
|
100 MC |
|
|
0.007 |
|
|
|
|
|
|
|
Loss factor |
D667-42T |
|
|
60 cycles |
|
|
- |
|
|
|
1 |
MC |
|
|
0.053 |
|
|
|
10 |
MC |
|
|
0.048 |
|
|
|
100 MC |
|
|
0.036 |
|
|
|
|
|
|
|
|
Te Value |
|
oC |
0.700 |
|
|
|
|
|
|
|
|
|
|
|
Ohms per centimeter |
|
Volume Bulk Resistivity at temperatures |
|
cube |
|
25 deg C |
|
|
> 1.0 x 1014 |
|
|
|
100 deg C |
|
|
6.0 x 1011 |
|
|
|
300 deg C |
|
|
2.0 x 10⁹ |
|
|
|
500 deg C |
|
|
5.0 x 10⁶ |
|
|
|
700 deg C |
|
|
3.5 x 10⁵ |
|
|
|
900 deg C |
|
|
5.0 x 10⁴ |
|
|
|
TYPICAL CHEMICAL ANALYSIS
COMPOUND |
DGWS (WT%) |
LGWS (WT%) |
|
|
|
SiO2 |
57.433 |
58.900 |
Al2O3 |
31.433 |
31.367 |
Fe2O3 |
0.970 |
1.300 |
TiO2 |
1.850 |
1.917 |
CaO |
0.045 |
0.029 |
MgO |
0.237 |
0.063 |
Na2O |
0.207 |
0.193 |
K2O |
0.627 |
0.707 |
MnO |
0.006 |
0.001 |
P |
0.073 |
0.055 |
Ba |
0.012 |
0.013 |
Cr |
0.047 |
0.021 |
Cu |
0.001 |
0.001 |
Ni |
0.001 |
0.001 |
Sr |
0.007 |
0.008 |
V |
0.029 |
0.032 |
Zn |
0.001 |
0.001 |
LOI |
6.700 |
6.133 |
C |
0.797 |
0.243 |
S |
0.011 |
0.013 |
|
|
|
TOTAL |
100.487 |
100.999 |
|
|
|
Disclaimer: The values given are indicative only as the material is a natural mineral with variations in chemical composition. * LGWS is Light Grey Wonderstone *DGWS is Dark Grey Wonderstone