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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.
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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Borosilicate Glass Sheet Formula: SiO₂ 81% / B₂O₃ 13% / Na₂O 4%
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