| 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 | ||||
| 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 | |
| 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 | |||
| 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 |