I. Introduction superfine powder is a transparent non-metallic minerals, high transparency, good whiteness, refraction 1.54, density 2.3, oil absorption 28, non-toxic, odorless, acid corrosion. Having high transparency, filler itself refractive index and the refractive index is very close to the vast majority of synthetic resin, so that the amount does not affect the transparency of the filler filling the finished product, can improve the surface smoothness and abrasion scratch products, low oil , filled with large, help to reduce the manufacturing cost of the product. Second, the relevant technical specification parameters measurement items Ky-8619 Ky-8629 Ky-8639 SiO2 silica% ≤ 65 70 75 MgO magnesia% ≤ 12 12 12 Al2O3 Alumina% ≤ 10 10 10 Whiteness Whiteness% ≥ 94 95 95 Oil Absorption Oil absorption (ml / 100g) 26-30 26-30 26-30 Specific Gravity specific gravity (t / m3) 2.7 2.7 2.7 PH Value PH value 7-8 7-8 7-8 Volatility volatile (containing crystalline water)% ≤ 1.85 1.85 1.85 Particle Size diameter D97 (μm) ≤ 6 4 2 Appearance Appearance White powder White powder White powder Specification project activity measured transparent powder silica% ≤ 75 MgO SiO2 MgO% ≤ 12 Al2O3 trioxide Al% ≤ 10 Whiteness Whiteness% ≥ 95 Oil Absorption Oil absorption (ml / 100g) 12-20 Specific Gravity specific gravity (t / m3) 2.7 PH Value PH value 7-8 Volatility volatile (containing water of crystallization)% ≤ 1.85 Particle Size particle diameter D97 (μm) ≤ 2 Mobility Extent activation degree% 95 Appearance Appearance white powder Third, the product using ultra-fine powder with a conventional transparent filler contrast, has high transparency, high hardness, low oil absorption, easy to disperse, stable and other characteristics. High transparency: filler itself refractive index and the refractive index is very close to the vast majority of synthetic resin, so that the filling amount of the filler does not affect the transparency of the finished product. High hardness: to improve the product surface smoothness and scratch resistant properties. Low oil: help to reduce the manufacturing cost of the product. Ease of dispersion: a variety of resin has good wetting, adsorption performance, easy to disperse. Strong stability: It has excellent weather resistance and excellent corrosion resistance. Suitable for: transparent masterbatch, rubber, paint industry, stearic acid salts, transparent acid salts, transparent silicone, transparent glass, plastic and other industries