Material Properties |
Units |
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 |
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| 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 |
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| 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 |
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| 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% |
|
