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Polishing

 

Aluminas are used in the surface polishing field of application either as trimming agents (measured by the “Cut” effect) or as polishing agents (measured by the “Polish” effect). Unground calcined aluminas that have a hardness index of 9 on the Mohs scale deburr the parts that are to be polished.
Alternatively, low calcined aluminas that are finely ground have an excellent polishing power but little deburring action.
Also fused aluminas can be used for high stock removal or lapping on materials like glass.
 
Market : 
Abrasives
Calcined alumina

Aluminas with intermediate to relatively high specific surface areas (BET 3- 75m²/g) with alpha alumina contents varying between 20% and 95%.These are produced by controlled rotary calcination of aluminium trihydroxide.

A4BS A4G10 A4G20 AC12B15 AC12B5
AC12TA AR12B10 AR12B15 AR12B25 AR12B5
AR12BFM AR12TA AR308TA AR4B15 AR4B25
AR4B5 AR4SB AR4TA AR75B10
Ground calcined alumina

These aluminas are ground in continuous ball-mills or air-jet mills to median particle sizes (d50) 3, 4, 5 or 6 µm.

AC34B3 AC35B5 AC44B4 AC44B5 AC44B6
Hard calcined alumina

These aluminas have low specific surface area (BET < 1m²/g) and are almost entirely alpha alumina. Standard soda content is 3000-4000 ppm and intermediate soda content is 2000-3000 ppm.  Hard calcined aluminas are produced in rotary kilns.   

AC35TA AC45TA
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