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    High-pure colloidal silica

    CS-20, CS-25 and CS-30 are three types of High-pure colloidal silica, their technical standards are listed in the table:

    Designation Standard
    CS-20 CS-25 CS-30
    Appearance Slight milky transparent to translucent liquid
    SiO2 (wt%) 20±1% 25±1% 30±1%
    Na2O (wt%) ≤0.2%
    Ions
    (ppm)    		 Fe ≤50
    Cl- ≤50
    SO42- ≤50
    Al2O3 ≤100
    CO32- ≤100
    Others <100
    PH (20°C) 8.0-9.5
    Density (20°C, g/cm3) 1.12-1.14 1.15-1.17 1.19-1.21
    Viscosity (20°C, mPa•S) ≤35
    Particle size (nm) 8-15
    Stability Six months

    Specification: The technical standards can be adjusted according to requirements.

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