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Wollastonite is a natural metasilicic acidic mineral. Its molecular formula is CaSiO3, and its constitutional formula is Ca3[Si3O9]. Wollastonite is triclinic. It is normally a white, greyish or ruddy assemblage of acicular and fibrous shapes. It shows vitreous luster, and the cleavage surface shows nacreous luster. Its hardness reaches 4.5-5.0, the expansion coefficient is 6.5×10-6 mm/(mm·ºC), the melting point is 1540ºC, the density is 2.75~3.10g/cm3.

Wollastonite has low conductivity, good insulation, low water solubility and oil absorbency. Its solubility in neutral water is no more than 0.0095g/100ml. With unique acicular shape and stable chemical property, wollastonite is featured with good heat resistance, hard wearing and corrosion resistance, and strengthening and reinforcing functions. Being innocuous, flavorless, and non-radioactive, it is extensively applied in functional paint, rubber and plastic, friction materials, building materials, paper making, metallurgy.

Wollastonite fiber is environmental inorganic functional filling of high quality.



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