Alumina Balls

Alumina balls are high-purity spherical ceramic shapes available from Goodfellow in a range of sizes from 0.2mm to 25mm diameter. With high hardness, compressive strength and wear resistance, alumina ceramic is valued for applications where resistance to corrosion, abrasion and thermal shock are priorities. Example applications for alumina balls include ball bearings, valve seats, grinding media and milling media. With 28 size variations, Goodfellow's alumina balls offer flexibility for prototyping and small-scale manufacturing across diverse industries.

Formula: Al₂O₃
Diameter: 10mm
Quantity: 10 Pcs
CAS Number: 1344-28-1
UOM Code: 596-278-77

SKU: 1000024456

Product Code: AL60-SP-000242

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Tolerances

Balls

Diameter	Standard	±5%
Diameter	Precision	See Item

Tolerances

Balls

Diameter	Standard	±5%
Diameter	Precision	See Item

Technical Data Sheet

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$115.12

each

Buy 5 for $93.24 each and save 19%
Buy 10 for $85.19 each and save 26%

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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	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