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Explore the benefits of Sibelco anorthosite as a greener alternative to kaolin in glass fibre production and in other applications



Anorthosite is an almost monomineralic, feldspathic rock with a variety of industrial applications.

Sibelco anorthosite is used as a replacement for kaolin in the glass fibre manufacturing process. Its inclusion delivers a range of benefits, including: 

  • less energy consumption / lower CO2 emissions
  • potential for higher yields
  • lower in heavy minerals, arsenic and lead
  • higher bulk density than kaolin, meaning lower transport costs 
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