Technical Data Sheet
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Ruby Balls

Ruby Balls from Goodfellow feature high-precision polished ruby spheres available in 20 variations with diameters ranging from 0.5mm to 10mm. These precisely crafted balls exhibit excellent hardness, chemical resistance, and optical properties. Potential applications for Ruby Balls include instrument bearings, high-end jewelry 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.
Formula: Al₂O₃ /Cr₂O₃ /Si₂O₃
Diameter: 0.5mm
Quantity: 10 Pcs
Type: Precision Sphere
Sphericity: 0.625µm
CAS Number: 1344-28-1
UOM Code: 015-927-37
SKU: 1000001988
Product Code: AJ60-SP-000120


Diameter Standard ±5%
Diameter Precision See Item
No Minimum order Despatch of products in stock within 48 hours Free technical support *Free delivery worldwide
  • Buy 5 for $156.36 each and save 19%
  • Buy 10 for $142.85 each and save 26%

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Diameter Standard ±5%
Diameter Precision See Item
Technical Data Sheet
Safety Data Sheet

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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
Element Value
Compressive strength( MPa ) 2100
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