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Formula: Al₂O₃ 99.9
Form: Foil
Material: Sapphire
CAS Number: 1344-28-1
Commodity: Ceramics
Polish:
0.05 - 0.1µm Ra
Surface Finish:
Polished on both sides
Sapphire sheets are a high-quality synthetic sapphire material with a hardness of 9 on the Mohs scale for excellent scratch resistance. Available from Goodfellow in 5 size variations, these sheets exhibit high thermal conductivity and broad optical transmission in the UV to IR range. Typical applications include semiconductor wafer substrates, high-temperature windows, laser components and scratch-resistant optical elements. Sapphire sheets provide the durability and optical properties of sapphire crystal in a thin, flat geometry suitable for industrial use.
Tolerances
Foil
| Thickness | ±20% |
|---|
Material Properties for Ceramics
Chemical Resistance
| Element | Value |
|---|---|
| Acids - concentrated | Good |
| Acids - dilute | Good |
| Alkalis | Good |
| Halogens | Good |
| Metals | Good |
Electrical Properties
| Element | Value |
|---|---|
| Dielectric constant | 7.5-11.5 |
| Dielectric strength( kV mm⁻¹ ) | 15-50 |
| Volume resistivity( Ohmcm ) | >10¹⁴@25 |
Physical Properties
| Element | Value |
|---|---|
| Refractive index | 1.71-1.79 |
| Useful optical transmission range | 200-5500nm |
| Apparent porosity( % ) | 0 |
| Water absorption - saturation( % ) | 0 |
| Density( gcm⁻³ ) | 3.985 |
Thermal Properties
| Element | Value |
|---|---|
| Melting point( C ) | 2050 |
| Upper continuous use temperature( C ) | 1800-1950 |
| Specific heat( J K⁻¹ kg⁻¹ ) | 750@25°C |
| Thermal conductivity( W m⁻¹ K⁻¹ ) | 35-40@20°C |
| Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) | 5.8@20-1000°C |
Mechanical Properties
| Element | Value |
|---|---|
| Tensile modulus( GPa ) | 350-390 |
| Hardness - Knoop( kgf mm⁻² ) | 2000 |
| Hardness - Vickers( kgf mm⁻² ) | 1600-1800 |
| Tensile strength( MPa ) | 250-400 |
Pultrusions
| Element | Value |
|---|---|
| Compressive strength( MPa ) | 2100 |
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