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Formula: Al₂O₃ 99.9
Form: Foil/Film/Sheet
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.
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Tolerances

Foil/Film/Sheet
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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