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AFBMA Grade 25 Alumina Balls

Formula: Al₂O₃
Form: Ball/Sphere
Material: Alumina
CAS Number: 1344-28-1
Commodity: Ceramics
Type: Precision Sphere
Sphericity: 0.625µm
AFBMA Grade 25 Alumina Balls (alumina spheres) are engineered for high-precision applications requiring dimensional accuracy and durability. Composed of high-purity alumina, these ceramic balls are used in precision bearing systems, ball milling media, and catalytic support structures. Their high hardness, wear resistance, and thermal stability make them ideal for industries such as aerospace, automotive, and materials processing, where low friction and high-temperature operation are critical. In research and development, these alumina balls are utilized for tribological testing, grinding of hard materials, and heterogeneous catalysis studies, supporting advancements in ceramic engineering, energy storage, and nanomaterials research.
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 9-10.1
Dielectric strength( kV mm⁻¹ ) Oct-35
Volume resistivity( Ohmcm ) >10¹⁴@25
Physical Properties
Element Value
Apparent porosity( % ) 0
Water absorption - saturation( % ) 0
Density( gcm⁻³ ) 3.9
Thermal Properties
Element Value
Melting point( C ) 2100
Upper continuous use temperature( C ) 1700
Specific heat( J K⁻¹ kg⁻¹ ) 850-900@25°C
Thermal conductivity( W m⁻¹ K⁻¹ ) 26-35@20°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) 8@20-1000°C
Mechanical Properties
Element Value
Tensile modulus( GPa ) 300-400
Hardness - Knoop( kgf mm⁻² ) 2100
Hardness - Vickers( kgf mm⁻² ) 1500-1650
Shear strength( MPa ) 330
Tensile strength( MPa ) 260-300
Pultrusions
Element Value
Compressive strength( MPa ) 2200-2600

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