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Grade: Grade 25
Formula: SiO₂
Form: Ball/Sphere
Material: Fused Silica
CAS Number: 7631-86-9
Commodity: Glasses
Diameter: 10mm
Sphericity: 0.625µm
Goodfellow's range of Grade 25 Fused Silica Balls with 2 variations, meet diverse application requirements. Made from high-purity fused silica, these balls exhibit excellent thermal shock resistance and low thermal expansion. Their spherical geometry and smooth surface finish make them ideal for applications like ball bearings, flow meters, and mixing processes where uniform quantitie, shape, and surface finish are critical. Goodfellow's fused silica balls enable precision engineering across industries like aerospace, automotive, and medical devices.
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 Glasses

Chemical Resistance
Element Value
Acids - concentrated Good
Acids - dilute Good
Alkalis Fair
Halogens Good
Metals Fair
Magnetic Properties
Element Value
Maximum permeability 365-2500nm
Coercivity - as cast( A m⁻¹ ) 1.46
Remanence ratio( Br/Bs ) 1715
Saturation flux density( T ) 3.8
Physical Properties
Element Value
Apparent porosity( % ) 0
Water absorption - saturation( % ) 0
Density( gcm⁻³ ) 2.18
Thermal Properties
Element Value
Upper continuous use temperature( C ) 900-1200
Specific heat( J K⁻¹ kg⁻¹ ) 750@25°C
Thermal conductivity( W m⁻¹ K⁻¹ ) 1.2-1.4@20°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) 0.5-0.75@20-1000°C
Mechanical Properties
Element Value
Tensile modulus( GPa ) 65-75
Hardness - Vickers( kgf mm⁻² ) 490
Electrical Properties
Element Value
Volume resistivity( Ohmcm ) 10¹⁴@25

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