Jiangxi Branch source of ultrafine wollastonite powder factory direct bulk sales Product Details Origin:? Jiangxi silica content:? 51 (%) Grade:?? Excellence for thermal expansion coefficient: 6.5-11.8 categories:?? Ultrafine powder refraction coefficient : 1.63 Melting point:.? 1540 (℃) (℃) Mohs hardness:? 4.5-5.5 Density:? 2.75 (g / cm3) (g / cm3) Whiteness:?? 91 (% (%)% PH value: 8.5? I. Introduction wollastonite powder is a natural calcium silicate mineral, is a white crystalline powder, crystal is divided into two kinds of low temperature and high temperature, low temperature becomes high temperature at 1125 ℃, the crystal structure of needle-shaped particles , mostly fibrous particles, rods and radial aggregates having glass and pearl luster, white, mineral melting temperature 1540 ℃, Mohs hardness of 4.5-6.0, density 2.87-3.09, insoluble in water, soluble in hydrochloric acid and decomposition. Second, product specifications, Indicators Project Specifications Model Indicators Project wollastonite 1250 SiO2 content% ≥ 51 Fe (iron) content% ≤ 0.02 D97 (um) 10 Whiteness particles% ≥ 91 PH value 8.5% loss on ignition 2 Oil absorption 25-35 trioxide two aluminum oxide, calcium 0.25 CaO% ≥ 47 Appearance white powder solid cargo status Note: You can produce different brightness in accordance with customer demand, purity, fineness of wollastonite three wide Main purpose. applies for plastics, paints, rubber, ink, building materials, ceramics and other industries.