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Precipitated Silica

  • Precipitated Silica

    Pharmaceuticals

    Molecular Formula SiO2
    Molecular Weight  60.1 gm/mol
    Sr.No. Test Parameters Specification / Limits
    1 Description A light, fine, white, amorphous powder.
    2 Identification About 20 mg gives the Reaction of Silicates.
    3 Solubility Practically insoluble in water and in Mineral acid Except Hydrofluoric acid. It dissolves in alkali on heating.
    4 pH Between 3.5 to 5.5
    5 Arsenic Not more than 8 ppm
    6 Heavy Metals Not more than 25 ppm
    7 Chloride Not more than 250 ppm
    8 Loss on Ignition
    (At 900℃ for 2 hours)
    Not more than 5.0 %
    9 Assay as SiO2 at Ignited basis Not Less than 99.0 %
    Molecular Formula SiO2
    Molecular Weight  60.1 gm/mol
    Sr. No. Test Parameters Specification / Limits
    1 Description A light, fine, white, amorphous powder.
    2 Solubility Practically insoluble in water and in Mineral acid Except Hydrofluoric acid.It dissolve in alkali on heating.
    3 pH Between 3.5 to 5.5
    4 Chloride Not more than 250 ppm
    5 Heavy Metal Not more than 25 ppm
    6 Loss on Ignition
    (At 900C for 2 hours)
    Not more than 5.0 %
    7 Assay as SiO2 at Ignited basis Not Less than 99.0 %
    Molecular Formula SiO2
    Molecular Weight  60.1 gm/mol
    Sr.No. Test Parameters Specification / Limits
    1 Description A light, fine, white, amorphous powder.
    2 Solubility Practically insoluble in water and in Mineral acid Except Hydrofluoric acid. It dissolves in alkali on heating.
    3 pH Between 3.5 to 5.5
    4 Loss on Drying
    (At 105 ℃ for 2 hours)
    NMT 2.5 %
    5 Loss on Ignition
    (At 900 ℃ for 2 hours)
    NMT 2.0 %
    6 Arsenic NMT 8 ppm
    7 Assay as SiO2 at Ignited basis NLT 99.0 %

    Pesticides & Detergents

    Sr. No. Description of Test Specification / Limits
    1 Appearance White Free Flowing Powder
    2 pH (5 % w/v) Aq. Sus. 6.0 to 7.0
    3 L.O.D. At 110 ℃ 2 hrs. % Mass by mass, 4.5 Max.
    4 Moisture Content % Mass by mass, 5.0 Max.
    5 Bulk Density Before Tapping
    Bulk Density After Tapping
    Gm/ml, 0.08 max.
    Gm/ml, 0.11 max.
    6 Loss on Ignition % Mass by mass, 10.0 Max.
    7 Silica Content % Mass by mass, 98.5 Min.
    8 Iron Content 200 PPM max.
    9 Other Soluble Salt % Mass by mass, 0.5 Max.
    10 Particle Size Passing through 200 BSS % Mass by mass, 99.0 Min.

    Special Low Moisture Grade

    Sr. No. Description of Test Specification / Limits
    1 Description White Free Flowing Powder
    2 pH (5 % w/v) Aq. Sus. 3.5 to 4.5
    3 Loss on Drying @ 105 for 2 hrs % Mass by mass, 1.0 Max.
    4 Water Content % Mass by mass, 1.0 Max. (K.F.)
    5 Bulk Density Loose NMT 0.08 gm/ml
    Tapped NMT 0.12 gm/ml
    6 Residue on 325 Mesh Not More Than 0.5 %
    7 Heavy Metal Not More Than 200 ppm
    8 Silica Content NLT 98.5 %
    9 Chloride NMT 500 ppm

    Free Flow Salt & Anticaking Agent

    Sr. No. Test Parameters Specification / Limits
    1 Characteristics White Free Flowing Powder
    2 pH (5 % w/v) Aq. Sus. 6.0 to 7.0
    3 Moisture Content % Mass by mass, 5.0 Max.
    4 Heavy Metal NMT 200 ppm
    5 SiO2 Content % Mass by mass, 98.0 Min.
    6 L.O.D. At 110 ℃ 2 hrs. % Mass by mass, 5.0 to 5.5 Max.
    7 Loss on Ignition % Mass by mass, 10.0 Max.
    8 Other Soluble Salt % Mass by mass, 0.5 Max.
    9 Particle Size Passing through 200 BSS % Mass by mass, 99.0 Min.
    10 Bulk Density Before Tapping
    Bulk Density After Tapping  
    -
    -
    11 Water Absorption ml/100 gm Min. 180 ml/100 gm

    For Cosmetics

    Sr. No. Description of Test Specification / Limits
    1 Characteristics White Free Flowing Powder
    2 pH (5 % w/v) Aq. Sus. 6.0 to 7.0
    3 Moisture Content NMT 5.0 %
    4 Heavy Metal NMT 200 ppm
    5 SiO2 Content NLT 98.0 %
    6 L.O.D. At 110 ℃ 2 hrs. Between 5.0 to 5.5 %
    7 Loss on Ignition NMT 10 %
    8 Refractive Index 1.4500
    9 B.E.T Surface Area Min.180 m2/gm
    10 Particle Size Passing through 325 BSS % Mass by mass, 99.0 Min.
    11 Bulk Density After Tapping Between 70 to 120 gm/ltr
    12 Water Absorption ml/100 gm Min. 180 ml/100 gm
    13 Linseed Oil Absorption NLT 250 ml/100 gm
    14 Viscosity (10 % Silica-Sorbitol w/w) NLT 1000 cps
    15 Microbiology Analysis (1) TVC
    (2) Y & M
    NMT 1000 cfu/gm
    NMT 100 cfu/gm
    Sr. No. Test Parameters Limits
    1 Characteristics White Free Flowing Powder
    2 pH (5 % w/v) Aq. Sus. 6.0 to 8.0
    3 Moisture Content 6.0 % Max.
    4 Heavy Metal NMT 100 ppm
    5 Arsenic NMT 10 ppm
    6 SiO2 Content 98.0 % Min.
    7 L.O.D. At 110 ℃ 2 hrs. 5.0 to 5.5 Max.
    8 Loss on Ignition 10.0 % Max.
    9 Other Soluble Salt 2.0 % Max.
    10 Residue on 325 Mesh (Wet Base) Max. 1.0 %
    11 B.E.T Surface Area NMT 80 m2/gm
    12 Particle Size Passing through 200 BSS % Mass by mass, 99.0 Min.
    13 Bulk Density Before Tapping
    Bulk Density After Tapping  
    -
    -
    14 Microbiological Analysis
    (1) TVC
    (2) Y & M

    NMT 1000 cfu/gm &
    NMT 100 cfu/gm