Micro Silica Specification
| MICRO SILICA | |
|---|---|
| STANDARD | ASTM C-1240 |
| SiO2 | 90 – 92% |
| +45 Microns | 5% Max |
| LOI | 3% Max |
| Moisture | 2.5% Max |
| SO3 | 2% Max |
| MgO | 5% Max |
| Alkali content (Na2O + 0.658 K2O) | 1.5% Max |
| Chloride content | 0.1% Max |
| Free CaO | 1% Max |
| Free SiO2 | 0.4% Max |
| Density | 500 – 600 Kg/m3 |
| MICRO SILICA | |
|---|---|
| STANDARD | BS 4550 |
| SiO2 | 90 – 92% |
| +45 Microns | 3% Max |
| LOI | 3% Max |
| Moisture | 2.5% Max |
| SO3 | 2% Max |
| MgO | 5% Max |
| Alkali content (Na2O + 0.658 K2O) | 1.5% Max |
| Chloride content | 0.1% Max |
| Free CaO | 1% Max |
| Free SiO2 | 0.4% Max |
| Density | 500 – 600 Kg/m3 |
| Sl No | Parameters | Results (%) | Actuals | Standards |
|---|---|---|---|---|
| 1 | SiO2 | 92.68 | 88 – 93 | ASTM C – 1240 |
| 2 | LOI (at 750OC) | 3.01 | 4% Max | ASTM C – 1240 |
| 3 | +45 Microns | 2.90 | 5% Max | ASTM C – 1240 |
| 4 | Al2O3 | 0.45 | < 2% | ASTM C – 1240 |
| 5 | Fe2O3 | 0.30 | < 1% | ASTM C – 1240 |
| 6 | SO3 | 0.16 | < 1% | ASTM C – 1240 |
| 7 | MgO | 0.42 | < 1% | ASTM C – 1240 |
| 8 | K2O | 0.21 | < 1% | ASTM C – 1240 |
| 9 | Na2O | 0.59 | < 1% | ASTM C – 1240 |
| 10 | pH Value | 7.5% Max | ASTM C – 1240 | |
| 11 | Density | 578 | 500 – 600 Kg/m3 | ASTM C – 1240 |
| 12 | Specific Surface Area (B.E.T) | > 16M2/gm | ||
| 13 | Pozzolanic Activity Index (7 Days) | 109 | 105% Min | |
| 14 | Pozzolanic Activity Index (28 Days) | 119 | 117% Min |
