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
- 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.