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Grade: Grade 25
Formula: SiO₂ 81% / B₂O₃ 13% / Na₂O 4%
Form: Balls
Material: Borosilicate Glass
Commodity: Glasses
Diameter:
10mm
Type:
Precision Sphere
Sphericity:
0.5µm
Grade 25 Borosilicate Glass Balls offered by Goodfellow come in 4 quantities. Borosilicate Glass is known for having very low coefficients of thermal expansion, high hardness, and high chemical resistance. These properties make borosilicate glass balls ideal for applications in scientific instrumentation, industrial processing equipment, and semiconductor manufacturing where dimensional stability, abrasion resistance, and inertness are critical. The balls can be used as mixing media, flow aids, grinding media, spacers, and other applications requiring precision glass spheres across a range of quantities.
Tolerances
Balls
| Diameter | Standard | ±5% |
|---|---|---|
| Diameter | Precision | See Item |
Material Properties for Glasses
Chemical Resistance
| Element | Value |
|---|---|
| Acids - concentrated | 0 |
| Acids - dilute | 0 |
| Alkalis | 0 |
| Halogens | 0 |
| Metals | 0 |
Electrical Properties
| Element | Value |
|---|---|
| Dielectric constant | 0 |
| Dielectric strength( kV mm⁻¹ ) | 0 |
| Volume resistivity( Ohmcm ) | 0 |
Mechanical Properties
| Element | Value |
|---|---|
| Poisson's ratio | 0 |
| Tensile modulus( GPa ) | 0 |
| Hardness - Knoop( kgf mm⁻² ) | 0 |
| Hardness - Vickers( kgf mm⁻² ) | 0 |
| Shear strength( MPa ) | 0 |
| Tensile strength( MPa ) | 0 |
| Fracture toughness( MPam(0.5) ) | 0 |
Physical Properties
| Element | Value |
|---|---|
| Refractive index | 0 |
| Useful optical transmission range | 0 |
| Apparent porosity( % ) | 0 |
| Water absorption - saturation( % ) | 0 |
| Density( gcm⁻³ ) | 2.23 |
Thermal Properties
| Element | Value |
|---|---|
| Melting point( C ) | 0 |
| Sublimation point( C ) | 0 |
| Upper continuous use temperature( C ) | 0 |
| Specific heat( J K⁻¹ kg⁻¹ ) | 0 |
| Thermal conductivity( W m⁻¹ K⁻¹ ) | 0 |
| Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) | 0 |
Pultrusions
| Element | Value |
|---|---|
| Compressive strength( MPa ) | 0 |