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Formula: Al₂O₃ /Cr₂O₃ /Si₂O₃
Form: Single Crystal
Material: Ruby
CAS Number: 1344-28-1
Commodity: Ceramics
Ruby Single Crystal is a type of single crystal offered by Goodfellow within their range of advanced engineered materials. Ruby has outstanding hardness, thermal conductivity, and chemical resistance. Its key properties make ruby well suited to applications like bearings, laser optics, and semiconductor substrates. With precise control of structure, Goodfellow produces high-quality ruby single crystals to meet the stringent requirements of research and industry.
Technical Data Sheet Safety Data Sheet Tolerance Properties
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Tolerances

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

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
Useful optical transmission range 150-5500nm
Apparent porosity( % ) 0
Water absorption - saturation( % ) 0
Density( gcm⁻³ ) 3.98
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 ) 2500-3000
Tensile strength( MPa ) 250-400
Pultrusions
Element Value
Compressive strength( MPa ) 2100

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