Jiangxi Branch source of ultrafine wollastonite powder factory direct bulk sales Product Details Place of Origin: Jiangxi silica content: 51 (%) Grade: Excellence for thermal expansion coefficient: 6.5-11.8 Category: ultrafine powder refraction factor: 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, low temperature and high temperature crystal into two, the low temperature becomes high temperature at 1125 ℃, the crystal structure of needle-like 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 * 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 0.25 CaO calcium oxide% ≥ 47 Appearance white powder solid cargo status Note: You can produce different brightness, purity, fineness of wollastonite in accordance with customer demand Third, the main purpose is widely used for plastics, paints, rubber, ink,. building materials, ceramics and other industries. Note: Powder Co., Ltd. Jiangxi Branch source can produce different brightness according to customer requirements, product fineness.