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Fillers with reinforcing properties


Wollastonite is a naturally occurring calcium silicate that is formed from quartz and calcium carbonate at a temperature of about 450°C. The structure of the individual wollastonite particles is determined by the respective geological formation and by the processing technology selected. Depending on the application as a high-performance filler, we produce blocky particle shapes with a low length/diameter ratio (Low Aspect Ratio—LAR TREMIN® 283 product series) and pronounced acicular wollastonite particles with a high length/diameter ratio (High Aspect Ratio—HAR TREMIN® 939 product series).


  • TREMIN® 939 products: acicular particles (length/dia. = 8:1) HAR
  • TREMIN® 283 products: blocky particles (length/dia. = 3:1) LAR
  • hardness of 4.5 (Mohs)
  • density of 2.85 g/cm3
  • low thermal coefficient of expansion:7*10-6 K-1 (at a temp. of 20–300°C)
  • excellent reinforcing properties

Main applications

  • technical plastic components (e.g., PP, PA, PU) for the automotive industry
  • fluoroelastomers, e.g. for rotary shaft seals
  • friction linings
  • powder paints
  • anti-corrosion coatings, including water-based EP/PUR

In any case you can assume an exceptionally high product quality—that is what our good name stands for.