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Formula: Al₂O₃ 99.9
Form: Single Crystal
Material: Sapphire
CAS Number: 1344-28-1
Commodity: Ceramics

Sapphire Single Crystal

Sapphire Single Crystal is a single crystal form of sapphire, an extremely hard and durable material made of aluminum oxide. With a Mohs hardness of 9, sapphire has excellent scratch resistance. It also has high strength at elevated temperatures. Sapphire's unique properties make it ideal for use in applications like scratch-resistant windows, high power semiconductor substrates, and sensors for extreme environments. As part of Goodfellow's extensive range of single crystal products, Sapphire Single Crystal exemplifies both the durability and versatility of these advanced materials.
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Tolerances

Single Crystal
Orientation See Item
Thickness +2% / -1%
Length +2% / -1%

Material Properties for Ceramics

Chemical Resistance
Electrical Properties
Physical Properties
Thermal Properties
Mechanical Properties
Pultrusions
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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    Percentage Purity: 99.99%
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    Orientation Accuracy: =< 1°
    Polish: Polished
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