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TECHNICAL DATA PROPERTIES OF
SYNTHETIC SAPPHIRE & RUBY
PHYSICAL / MECHANICAL |
Chemical Formula: AL2 03
(monocrytalline/hexagonal)
Density: 0.143 lb/in3 (3.97 gm/cm3)
Specific Gravity: 3.97
Tensile Strength: 60,000 psi (2600 kg/cm2) min @ 25°
Compressive Strength: 350,000 psi (21,000 kg/cm2)
Modulus of Rupture: 67,000-95,000 psi (4000-7000kg/cm2)
Modulus of Rigidity: 25 x 106 psi (19,000 kg/mm2)
Young’s Modulus: 51 x 104 psi
Hardness: 9 (MOHS) /1800—2200 (KNOOP) / 2500-3000 (VICKERS)
Poisson’s Ratio: 0.28 — 0.33
Coefficient of Friction: 0.14 (Dry Friction on Steel)
Porosity: 0 % |
THERMAL |
Melting Point: 3725 0F (2053
0C)
Specific Heat: 0.18 cal/g 0C
Thermal Conductivity: 0.09 cal/sec—cm 0C
Maximum Operating Temperature: 3632 0F (2000 0C)
Coefficient of Thermal Expansion: 4.8—5.3x10-6 cm/cm 0C |
ELECTRICAL |
Electrical Resistivity: 1016 ohm—cm
(@25 0C)
Dielectric Strength: 480,000 volt/cm (@60 Hz)
Dielectric Constant: 8.5 — 10.5 (300 KHz — 1 GHz)
Dielectric Loss Tangent: < 0.0001 |
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