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Rubysapphire - Materials - Technical Information - Hobby and Engineering

Synthetic Ruby and Sapphire

MBA Products made from this material
Balls

Synthetic ruby and sapphire balls are available from MBA. 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 isn’t a problem.

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

The MBA range of ruby and sapphire balls are mostly produced to Grade 25.

Physical Properties
PROPERTY UNIT VALUE
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 MBA online catalogue.

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Hobby and Engineering Supplies offers thousands of products including remote controlled cars, planes, boats, and helicopters. We stock spare parts for remote controlled models. Our range includes the popular Solarbotics solar model kits and spares. We also distribute the full range of miniature engineering products from Miniature Bearings Australia. This range includes small bearings, timing pulleys, timing belts, seals, o-rings, gears and more. Also available from our store in Capalaba Queensland are a full range of lubricants, adhesives, balsa wood and plastic rod and sheet materials. See our Online Catalogue for more information. Our main business is handled from our sales counter and showroom at 3239 Old Cleveland Road Capalaba West, Queensland, Australia, but we also sell by phone, fax, online and mail order. We also offer all of our hobby and engineering parts through our online store.

Using the links at the top of this page you will find extensive information including catalogues (Products and Store link), technical data, and other product specific information.

We also suggest that you may want to take a look at the technical information sites - Shafting Information, Couplings Information and Gearboxes Information.

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