Consisting of doped monocrystalline aluminium oxide, these ruby balls are distinguished by their superb hardness and exceptional corrosion resistance. Ideal for demanding environments, they are perfectly suited for applications requiring dimensional stability and wear resistance. Marteau-Lemarie, with its 40-year-old expertise, offers you these balls of unparalleled quality, available in stock in France for fast delivery.
Physical characteristics of ruby ball
| Ownership | Value | Unit |
|---|---|---|
| Density | 3.98 | g/cm3 |
| Young Module | 420 | GPA |
| Thermal expansion coefficient | 5.8 (T=0-100°C) | × 10−6 /°C |
| Thermal conductivity | 39 | 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 ruby ball
| Ownership | Value | Unit |
|---|---|---|
| Hardness | 1570-2170 | HV |
| Exercise temperatures | -196/1750 | ° C |
| Exercise temperatures | -320,8/3250 | °F |
Diameters and grades available for ruby ball
| Parameter | Value |
|---|---|
| Minimum diameter | 0.127 mm — 0.005′′′ |
| Maximum diameter | 14.986 mm — 0.590′′′ |
| Grades available | G3-5-6-10-25 |
Corrosion resistance of ruby ball
Good corrosion resistance in contact with acids (even strong), alkalis and halogens, including high temperatures.
Ruby ball applications
Special bearings, pumps and valves (chemical pumps, safety valves), measuring instruments, pen tips and sensors, optical applications, flow meters, styles.
