Silica fume is a kind of smoke gray ultrafine powder. With the carbon content, the color changes slightly. The bulk density of white 40-50 is about 200kg / m3, and the true density is 2.2 g/cm3. The vast majority of microsilica particles is less than 1 um, finest is 0.01 um, the measured surface area is 26 – 36 m2 / g using nitrogen adsorption method, the specific surface area is 70 to 90 times of cement, because the micro silica specific surface area is large, so it has good volcanic ash activity and filling ability.
Specific surface area and particle size distribution:
| Specific surface area (m2/g) | Particle size distribution (um) | ||||
| 0-0.3 | 0.3-0.5 | 0.5-0.7 | 0.7-1.0 | 1.0-5.0 | |
| 28.4 | 44.8 | 20.2 | 5.2 | 5.2 | 24.6 |
| 35.3 | 51.1 | 20.4 | 6.4 | 4.8 | 14.3 |
| 31.4 | 63.5 | 14.7 | 3.5 | 3.5 | 14.7 |
Where to buy silica fume particle size?
The main producing countries of the micro silica fume powder abroad are the United States, Russia, China, Japan and Norway.
The main application fields of high purity microsilica powder abroad:
1, marine anticorrosion architecture 30%
2, advanced refractory industry 30%
3, highway, bridge and special cement 30%
4. Chemical and electronic 5%
5, other 5%
