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 900°C 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 % |
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. |
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 |
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 |
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 |