Technical Data Sheet
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Grade 25 Silicon Balls

Grade 25 Silicon Balls are a range of precision balls produced by Goodfellow. Available in 2 variations, these high purity silicon balls exhibit excellent corrosion resistance and high strength-to-weight ratio. With diameters ranging from 1 to 10 mm, Grade 25 Silicon Balls find use in applications from ball bearings to flow regulators in chemical plants. Their precise dimensions and silicon composition make them ideal for experimental apparatus requiring inert, dimensionally stable sphere components.
Grade: Grade 25
Formula: Si
Diameter: 0.48mm
Quantity: 10 Pcs
Type: Precision Sphere
Sphericity: 0.625µm
CAS Number: 7440-21-3
UOM Code: 293-210-30
SKU: 1000124677
Product Code: SI00-SP-000105

Tolerances

Balls
Diameter Standard ±5%
Diameter Precision See Item
No Minimum order Despatch of products in stock within 48 hours Free technical support *Free delivery worldwide
$325.86
each
  • Buy 5 for $263.95 each and save 19%
  • Buy 10 for $241.14 each and save 26%

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may apply for some hazardous materials.

Tolerances

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

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Material Properties for Metals

Atomic Properties
Element Value
Atomic number 14
Crystal structure Diamond
Electronic structure Ne 3s² 3p²
Valences shown 4
Atomic weight( amu ) 28.0855
Thermal neutron absorption cross-section( Barns ) 0.16
Photo-electric work function( eV ) 4.2
Natural isotope distribution( Mass No./% ) 30/ 3.10
Natural isotope distribution( Mass No./% ) 29/ 4.67
Natural isotope distribution( Mass No./% ) 28/ 92.23
Atomic radius - Goldschmidt( nm ) 0.117
Ionisation potential( No./eV ) 5/ 167
Ionisation potential( No./eV ) 1/ 8.15
Ionisation potential( No./eV ) 2/ 16.3
Ionisation potential( No./eV ) 3/ 33.5
Ionisation potential( No./eV ) 4/ 45.1
Ionisation potential( No./eV ) 6/ 205
Mechanical Properties
Element Value
Hardness - Mohs 7
Material condition Polycrystalline
Poisson's ratio 0.42
Bulk modulus( GPa ) 100
Tensile modulus( GPa ) 113
Electrical Properties
Element Value
Electrical resistivity( µOhmcm ) 23 x 10¹⁰@20@20°C
Thermal emf against Pt (cold 0C - hot 100C)( mV ) -41.56
Physical Properties
Element Value
Boiling point( C ) 2355
Density( gcm⁻³ ) 2.34@20°C
Thermal Properties
Element Value
Melting point( C ) 1410
Latent heat of evaporation( J g⁻¹ ) 13700
Latent heat of fusion( J g⁻¹ ) 1650
Specific heat( J K⁻¹ kg⁻¹ ) 703@25°C
Thermal conductivity( W m⁻¹ K⁻¹ ) 80-150@0-100°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) 4.7-7.6@0-100°C
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