Metakaolin - general information

What is metakaolin?

Metakaolins produced by České lupkové závody, a.s. are obtained through controlled thermal processes and grain size adjustments of clay stones and floating kaolin clays with stable chemical composition. It is a highly active pozzolan on base of metakaolinite.

Application possibilities

Metakaolins are produced trough a unique and longtime verified method, complying with ISO 9001:2009 certifications

  • Additive to concrete (shotcrete, high strength concrete, lightweight concrete)
  • Mortar mixtures
  • Insulations systems
  • Fire protection systems
  • Replacement of microsilica in selected applications
  • Production of geopolymers
  • Use by construction of swimming pools and natural small lakes (including salt water)
  • Waterproof coatings for aggressive environments
  • Ingredient in sealants
  • Filler for composite materials and plastic insulating materials


  • strength increase
  • reduction of water absorption
  • increased frost resistance
  • increased thermal resistance
  • porosity reduction
  • increased chemical resistance
  • reduction of concrete efflorescence forming
  • increased salt resistance
  • reduced alkali-silica reaction