Made of glass, these balls are distinguished by their excellent chemical and thermal stability. Ideal for applications requiring electrical insulation, they also support high external pressures and stresses. With over 40 years of expertise, Marteau- Lemarie offers these logs in stock in France for quick delivery.
Physical characteristics of the black glass ball
| Ownership | Value | Unit |
|---|---|---|
| Density | 2.57 | g/cm3 |
| Young Module | 66 | GPA |
| Thermal expansion coefficient | 7.2 (T=0-100°C) | × 10−6 /°C |
| Thermal conductivity | 0.76 | W/m·K |
| Volume resistivity | >10^14 | D·m |
| Relative magnetic permeability | <~1 | — |
| Magnetic behaviour | Diamagnetic | — |
| Softening temperature | 650 | ° C |
| Refraction index | 1.52 | — |
Hardness and mechanical resistance of black glass ball
| Ownership | Value | Unit |
|---|---|---|
| Hardness | 468-530 | Knoop |
| Hardness | 6 | Mohs |
| Exercise temperatures | 0/300 | ° C |
| Exercise temperatures | 32/572 | °F |
Diameters and grades available for black glass ball
| Parameter | Value |
|---|---|
| Minimum diameter | 1 mm — 3/64′′′ |
| Maximum diameter | 100 mm — 4′′ |
| Grades available | G25-50-100-200-500-1000-2000 |
Corrosion resistance of black glass ball
Good corrosion resistance in contact with most acidic and basic substances.
Applications of black glass ball
Chemical and medical flow meters, instruments for aerospace industry.
