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Formula: Al₂O₃ /Cr₂O₃ /Si₂O₃
Form: Bar
Material: Ruby
CAS Number: 1344-28-1
Commodity: Ceramics
Side Length: 2mm
Side Length (Of Longer Side): 2mm
Length: 12mm
Ruby Bar provides extreme hardness, wear resistance, and optical transparency in a rigid elongated form suitable for structural and optical applications. Composed primarily of aluminum oxide doped with chromium, ruby exhibits excellent scratch resistance and thermal stability. The bar geometry allows for use in precision alignment rods, mechanical wear guides, and high-durability optical mounts. Industries employ ruby bars in high-precision metrology tools, laser component assemblies, and jewel bearings for instrumentation. Research applications include optical calibration systems, studies on high-temperature mechanical stability of crystalline materials, and the development of abrasion-resistant components. The combination of ruby’s crystalline properties and the bar form’s mechanical robustness ensures performance in demanding engineering and scientific environments.
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Tolerances

Bar
Side Length =<10mm ±10%
Side Length >10mm ±1mm
Side Length (Of Longer Side) >10mm ±1mm
Side Length (Of Longer Side) =<10mm ±10%
Length <100mm ±1mm
Length >=100mm +5% / -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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