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Fillers

 

A number of important applications require alumina as filler:
  • Sanitaryware : where ATH enhances the mechanical strength and improves durability. Compounds can be loaded with up to 60 % ATH (SH150).
  • Brake linings: ground alumina (AC44B6 and P122B) is one component of friction materials, where alumina hardness is used to improve wear resistance.
  • High-voltage insulators: for resin based insulators the very low conductivity of alumina (AC34B6) makes it an ideal filler for epoxy resin.
  • Toothpaste:  alumina and ATH can be used as polishing agents for teeth (SH80 and AC34B6).
  • Nuclear waste transportation:  thermoset resin filled with ATH (SH150) is one of the layers of protection for nuclear waste transportation. The ATH is mainly used for its ability to absorb neutrons.
  • Welding fluxes: Electrodes containing alumina (AC45) are used to shield the weld area from atmospheric oxygen and nitrogen. 
 
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Fine alumina hydrate

Aluminium trihydroxide (ATH) produced by the Gardanne Bayer process is subject to controlled grinding to obtain a range of particle size distributions and low viscosity grades.

SH150 SH30 SH80
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.

AC34B4 AC34B5 AC34B6 AC44B6 GA4I
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.   

AC34 AC44 AC45
Low soda alumina

This alumina has very low soda content: between 300 and 500ppm. Carefully controlling calcination using the proprietary Reynolds process also allows a wide range of primary crystal size to be offered.  

P122B
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