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Typical Properties

Material Properties

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Duralox
Colour - White
Specific Gravity - 3.7
Water absorption % 0.0
Flexural strength Kg/cm2 3,200
Compressive strength Kg/cm2 20,000
Hardness HV10 1,300
Coefficient of linear thermal expansion
(20°C-1000°C)
X10-6/°C 7.6
Safe operating temperature (No Load) °C 1,400
Dielectric strength (20°C)5 mm thick KV/mm 25
Dielectric constant (20°C: 1MHZ) - 8.6
Dissipation factor 20°C: 1MHZ - 0.0004
Volume resistivity (20°C) Ohm-cm >1013

     
     
     
     
Hardness Comparison
Material   Moh Hardness
Diamond
 
10
Sapphire
 
9
D u r a l o x
 
9
Topaz
 
8
Cast Basalt
 
7.5
Quartz
 
7
Tool steel
 
6.5
Silica
 
6.0
Glass
 
5.5
Carbon Steel
 
5.5
Limestone
 
3.4
Copper
 
3
Gypsum
 
2
Talc
 
1

     
     
     
     
Physical Properties
Composition
:
92% Al,2O3
Average Crystal Size
:
2-10 microns
Colour
:
White
Specific Gravity
:
> 3.7
Fusion Temperature
:
> 1900°C (3450°F)
Maximum use temperature (no load condition)
:
> 1400°C (2550°F)
Compressive Strength (20°C)
:
20,000 Kg cm2
Tensile Strength (20°C)
:
2000 Kg / cm
Flexural Strength (20°C)
:
3200 Kg / cm
Hardness (on Moh's Scale)
(Hv 10)
:
:
9
1300
Porosity
:
Gas tight
Water Absorption
:
Nil
Modulus of Elasticity
:
2.7 x 106 /°C
Co-efficient of thermal expansion (20°C - 1000°C)
:
7.6 x 10-6 /°C
     
     
     
     
Chemical Properties
Al2O3
:
92.3%
SiO2
:
2.50%
MgO
:
2.45%
CaO
:
2.10%
Na2O
:
0.29%
BaO
:
0.13%
Fe2O3
:
0.07%
TiO2
:
0.06%
Others
:
0.05%
 
         
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