Standard available sheet product features include:
Material Comparison to Saint-Gobain Synthetic Sapphire Window |
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---|---|---|---|---|---|---|---|---|
Transparency Type | Material |
Density g/cc |
Areal Density psf/in |
Young's Modulus Gpa |
Knoop Hardness Kg/mm2 |
Fracture Toughness MPa-m1/2 |
Thermal Conductivity W/m-K |
Thermal Expansion 10-7/K |
Glass | Soda-Lime Glass | 2.52 | 13.1 | 69.6 | 585 | 0.75 | 0.9 - 1.3 | 90 |
Glass-Ceramic | Li-Alumino-Silicate | 2.52 | 13.1 | 88.5 | 570 | 1.1 | 1.6 - 1.3 | 0 |
Ceramic | ALON® | 3.69 | 19.2 | 323 | 1850 | 2 | 9.6 | 56 |
Spinel | 3.58 | 18.6 | 277 | 1645 | 1.5 - 2 | 14.7 | 60 | |
Sapphire | 3.9 | 20.2 | 435 | 2000 | 2 | 32 | 60 | |
Metal | Armor Steel | 7.9 | 40.8 | 210 | 340 | 7 | 40 - 60 | 115 |
Note: Armor steel (opaque) is included as a reference only
Properties | Value |
---|---|
Density | 3.97 gm/cm3 (0.143 lb/in3) (25°C) |
Young’s Modulus | 435 GPa (63 x 106 psi) parallel to C-axis (25°C) 386 GPa (56 x 106 psi) parallel to C-axis (1000°C) |
Modulus of Rigidity (Shear Modulus) | 175 GPa (26 x 106 psi) |
Flexural Strength | 1035 MPa (150 kpsi) parallel to C-axis (25°) 760 MPa (110 kpsi) perpendicular to C-axis (25°) |
Compressive Strength | ≈2 GPa (300 kpsi) (25°) |
Hardness |
9 Mohs scale (between 20° and 25°C) 1900 Knoop parallel to C-axis |
Properties | Value |
---|---|
Transmission | UV through midwave IR (~200-5000nm) |
Uniaxial Negative Refractive Index | Ordinary ray (C-axis) No = 1.768 Extraordinary ray Ne-1.760 Birefringence: 0.008 |
Temperature Coefficient of Refractive Index | 13 X 10-6/°C (visible range) |
Spectral Emittance | 0.1 (1600°C) |
Spectral Absorption | 0.1 – 0.2cm-1 (0.66 μm, 1600°C) |
Properties | Value |
---|---|
Melting Point | 2053°C (3727°F) |
Specific Heat | 0.181 cal/gm°K (25°C) 0.300 cal/gm°K (1000°C) |
Thermal Conductivity | 0.4 watts/cm°K (25°C) 0.1 watts/cm°K (1000°C) |
Thermal Expansion Coefficient | (25 – 1000°C) 8.8 x 10-6; parallel to C-axis 7.9 x 10-6; perpendicular to C-axis |