Technical Data Sheet

TYPICAL PHYSICAL PROPERTIES

Download Technical Data Sheet
 
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