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Formula: Al₂O₃ /Cr₂O₃ /Si₂O₃
Form: Powder
Material: Ruby
CAS Number: 1344-28-1
Commodity: Ceramics
Max Particle Size: 45μm
Ruby Powder consists of fine particles of synthetic aluminum oxide doped with chromium (Al₂O₃:Cr), offering high hardness, thermal stability, and distinctive fluorescence under specific light excitation. Its fine particle size and stable crystalline structure make it a versatile material for industries such as laser optics, advanced ceramics manufacturing, and sensor technology. It is employed in producing luminescent coatings, sintered optical components, and high-performance polishing media for precision optics. Technologies such as temperature-sensitive optical films, high-precision abrasives, and laser gain media benefit from ruby powder’s tunable optical properties and robust physical characteristics. In research, it is essential for developing novel photonic devices, thermal sensing materials, and experimental laser systems. Its combination of functional versatility and reliable performance under extreme conditions makes it highly valued in cutting-edge industrial and scientific applications.
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Tolerances

Powder
Mean Particle Size Nominal
Minimum Particle Size Nominal
Maximum Particle Size Nominal
Maximum Particle Size Nominal
Particle Size D10 Nominal
Particle Size D50 Nominal
Particle Size D90 Nominal

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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