The inorganic natural fiber wollastonite is a calcium
metasilicate with a chain structure consisting of at least 96.5 % CaO and SiO2.
The fiber diameter ranges from 10 pm to 100 pm; under mechanical wear a
fracturing into fibrous pieces with diameters as small as 0.1 pm is possible.
Critical diameter ranges can be prevented through the use of appropriate
production methods, however.
Wollastonite is used as filling material in the areas of fire
protection (sheets), thermal and electrical insulation (sheets, fill for
moulding material), friction linings, structural elements and other construction
products, chemical products and others (paints, glues and moulding