Made of monocrystalline aluminium oxide, these balls are distinguished by their transparency and their exceptional hardness, guaranteeing a high resistance to wear and extreme temperatures, as well as corrosion. Choose this ball for applications requiring precision and reliability in demanding environments. Marteau- Lemarie, with over 40 years of technical expertise, offers you a stock available in France for quick delivery.
Physical characteristics of sapphire ball
| Ownership | Value | Unit |
|---|---|---|
| Density | 3.98 | g/cm3 |
| Young Module | 415 | GPA |
| Thermal expansion coefficient | 6 (T=0-100°C) | × 10−6 /°C |
| Thermal conductivity | 40 | W/m·K |
| Volume resistivity | >10^14 | D·m |
| Specific heat | 750 | J/kg·K |
| Relative magnetic permeability | <~1 | — |
| Magnetic behaviour | Diamagnetic | — |
| Friction coefficient | 0.15 | — |
Hardness and mechanical resistance of sapphire ball
| Ownership | Value | Unit |
|---|---|---|
| Hardness | 1600-2300 | HV |
| Exercise temperatures | -196/1800 | ° C |
| Exercise temperatures | -320,8/3272 | °F |
Diameters and grades available for sapphire ball
| Parameter | Value |
|---|---|
| Minimum diameter | 0.2 mm — 1/128′′′ |
| Maximum diameter | 20 mm — 25/32′′′ |
| Grades available | G3-5-6-10-25 |
Corrosion resistance of sapphire ball
Sapphire balls have excellent corrosion resistance, better than ruby, in both acidic and basic environments (even strong). They are attacked only by molten compounds based on Li, B, F, Na, K.
Application of sapphire ball
Special bearings, chemical, medical and safety valves, flow meters, pen tips, measuring instruments, bar code readers, fiber optic connectors.
