Ruby Sapphire Balls are ceramic balls that are opaque red in color and frequently used in gauging devices. Ruby Sapphire is resistant to most corrosive material even at very high temperatures. Ruby Sapphire’s maximum useful temperature is 3250° F.
| Compressive Strength | 300,000 psi |
| Maximum Useful Temperature | 3180°F |
| Thermal Conductivity | .086 Cal/sec cm °C |
| Thermal Expansion | 3.2 x 10 to the -6th power / °F |
| Electrical Resistivity | 10 to the 9th power Ohm/cm (@500°C), 10 Ohm/cm (@2000°C) |
| Young’s Modulus of Elasticity | 50 x 10 to the 6th power psi – 55 x 10 to the 6th power psi |
| Hardness | 1570-1800 Vickers |
| Density | .144 lbs/inch to the 3rd power |