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    Acidic colloidal silica

    Acidiccolloidal silica can be divided into HS-10 and HS-25. Their technical standards are listed bellow：

    Designation Standard
    HS-10       HS-15   HS-20  HS-25
    Appearance Slight milky transparent to translucent liquid
    SiO2 (wt%) 10±1% 15±1%  20±1% 25±1%
    Na2O (wt%) ≤0.1%
    PH (20°C) 1.5-3.0
    Density (20°C, g/cm3) 1.06-1.08 1.08-1.10  1.12-1.14 1.15-1.17
    Viscosity(20°C, mPa•S) ≤10
    Particle size(nm) 8-15
    Stability Six months
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