General Properties
| Specific surface area | 200ÿ240 mÿ2ÿ /g |
| (BET) Bulk density | 40 g/L (approximately) |
| pH (4% suspension) | 4.2 |
| SiO2 purity (dry basis) | > 99.9 % |
| Cl | < 50 ppmÿ |
| Al | < 20 ppmÿ |
| Fe | < 20 ppmÿ |
| 325 mesh coarse | < 0.01 % |
| grain moisture (loss on drying method, %) | < 1.5 % |
Special Properties
Large specific surface area and small
particle size. Primary particle size: about 12 nm
