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Single Crystal Sapphire
| Properties | Units | Test | Value |
|---|---|---|---|
| Physical | |||
| Chemical Formula | a-Al2O3 | ||
| Density, r | g/cm3 | ASTM C20 | 3.97 |
| Color | white/ transparent | ||
| Crystal Structure | trigonal | ||
| Water Absorption | % @R.T. | ASTM C373 | 0.0 |
| Hardness | Moh's | 9 | |
| Hardness | knoop (kg/mm2) | Knoop 100g | 2200 |
| Mechanical | |||
| Compressive Strength | MPa @ R.T. | ASTM C773 | 2000 |
| Tensile Strength | MPa @ R.T. | ACMA Test #4 | 250 - 400 |
| Modulus of Elasticity (Young's Mod.) |
GPa | ASTM C848 | 250 - 400 |
| Flexural Strength (MOR) | MPa @ R.T. | ASTM F417 | 760 - 1035 |
| Poisson's Ratio, u | ASTM C818 | 0.29 | |
| Fracture Toughness, KIc | MPa x m1/2 | Notched Beam Test | 1.89 |
| Thermal | |||
| Max. Use Temperature (* denotes inert atm.) |
ºC | No load cond. | ~2000 |
| Thermal Shock Resistance | DT (ºC) | Quenching | 200 |
| Thermal Conductivity | W/m-K @ R.T. | ASTM C408 | 40 |
| Coefficient of Linear Thermal Expansion, al | mm/m-ºC (~25ºC through ±1000ºC) | ASTM C372 | 7.9 - 8.8 |
| Specific Heat, cp | cal/g-ºC @ R.T. | ASTM C351 | 0.18 |
| Electrical | |||
| Dielectric Constant | 1MHz @ R.T. | ASTM D150 | 9.3 - 11.4 |
| Dielectric Strength | kV/mm | ASTM D116 | 15 - 50 |
| Electrical Resistivity | Wcm @ R.T. | ASTM D1829 | 1017 |
* Although we have gone to great
lengths to ensure the accuracy of this data, Intermat offers this information
for comparison only, and disclaims any and all liability from error, omissions
or inaccuracies, such that it does not constitute a warranty or representation
for which we shall assume legal responsibility.
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