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Formula: Al₂O₃ /Cr₂O₃ /Si₂O₃
Form: Ball/Sphere
Material: Ruby
CAS Number: 1344-28-1
Commodity: Ceramics
Type: Precision Sphere
Sphericity: 0.625µm
Ruby Balls from Goodfellow feature high-precision polished ruby spheres available in 20 variations. These precisely crafted balls exhibit excellent hardness, chemical resistance, and optical properties. Potential applications for Ruby Balls include instrument bearings and laser optics.. With their superior physical characteristics and precision manufacturing, Goodfellow's Ruby Balls offer exceptional performance across a variety of scientific, industrial, and commercial uses.
Technical Data Sheet Safety Data Sheet Tolerance Properties
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Tolerances

Ball/Sphere
Diameter Standard ±5%
Diameter Precision See Item

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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