Rubysapphire - Materials - Technical

Synthetic Ruby and Sapphire

BSO Products made from this material

Synthetic ruby and sapphire balls are available from SPB. The material offers extreme hardness, wear resistance, non-corrosiveness and chemical inertness with a specific gravity of 3.98. Ruby and sapphire balls are used in chemical pump check valves, wind indicators, probe and test measurement tips, medical check valves, master ball gauging sets, ball plug gauges, sapphire fiber optic lens systems, tracer tips, gyroscopic wear points and precision metering valve assemblies.

Ruby and sapphire balls can be used for low friction and long wear bearing applications. The melting point is 2,000oC and oxidation of the material isnít a problem.

Sapphire balls offer good optical qualities with a refractive index of 1.76.

the Bearing Shop Online range of ruby and sapphire balls are mostly produced to Grade 25.

Physical Properties
Compressive Strength MPa 2060
Hardness kgf.mm2 1570 to 1800
Youngs Modulus of Elasticity GPa 344
Density g/cm3 3.98
Coefficient of Thermal Expansion per oC 5.79 x 10-6
Max. use temperature (unloaded) oC 1740
Electrical Resistivity ohm/cm >1014 @ 25oC
Electrical Resistivity ohm/cm 2.5x106 @ 900oC

Various ceramic products can be found in the Bearing Shop Online Ceramic online catalogue pages.

Silicon Nitride products can be found here in theBearing Shop Online Silicon Nitride Online Store pages.

The Small Parts and Bearings has a much larger range of engineering supplies.

Hobby and Engineering Supplies lists a smaller range of products and only the most popular items in each range. They also list many additional hobby specific categories.

For the best range of miniature and small bearings please try the Miniature Bearings Australia website. Miniature Bearings Australia also list a large variety of miniature engineering products.

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