Aluminium Oxide is found naturally and the gem stones Sapphire & Ruby are made mostly from Aluminium Oxide with trace impurities deciding the final colour.


There are several methods of producing Aluminium Oxide from bauxite. Each method produces a different level of quality suitable for differing end uses.

The Aluminium Oxide sold by Industrial Minerals and used in the abrasive industry is normally produced at very high temperatures in controlled arc furnace.  The degree of control allows  a very hard product to be produced and at a typical hardness of 9.0 Mohs, a product ideal for abrasive users.

Industrial Minerals (NZ) Ltd has Brown & White Aluminium Oxide available packed in 25kg bags

Grit Size Number Nominal Particle Size Range (microns)
#16 1400~1180
#24 850~710
#36 600~500
#60 300~250
#80 212~180
#90 180~150
#120 125~106
#150 106~75
#180 90~63
#220 75~63
#240 63~53

The information provided is, to the best of our knowledge, representative of the product. Natural products do vary, so these figures are approximations for guidance only.  As conditions of use are beyond our control, no liability is accepted for any loss or damage sustained arising from the use of this information or any products. Because of ongoing development the product parameters may be changed without notice.

If you have any questions or comments about this web site either free phone 0800 646 3725 or go to our feedback page
Copyright 2006-2013 Industrial Minerals (NZ) Ltd