Ruby Sapphire Balls

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


Other Ceramic Ball Types:

Alumina Oxide Balls

Silicon Nitride Balls

Zirconia Balls

The information on this web site is intended for guidance only. Since we gathered technical data from various technical sources, the actual mechanical and physical properties will vary from one lot of material to the next. Therefore, we accept no liability for deficiencies or damages arising from the use of this data, and customers should determine the suitability of a material or product by conducting practical tests under realistic conditions.