Chemical composition of silica fume in the world:
Physical and chemical properties | United States | Europe | Canada | Japan | China | Brazil | South Korea | Italy |
SiO2 (%) | ≥ 85.0 | ≥ 85.0 | ≥ 85.0 | ≥ 85.0 | ≥ 85.0 | ≥ 85.0 | ≥ 85.0 | ≥ 85.0 |
SO3 (%) | < 2.0 | < 1.0 | < 3.0 | < 3.0 | ||||
cl (%) | < 0.3 | < 0.1 | < 0.2 | < 0.3 | ||||
free Cao (%) | < 1.0 | < 1.0 | ||||||
MgO (%) | < 5.0 | < 5.0 | ||||||
free Si (%) | < 0.4 | |||||||
Alkali content (%) | < 1.5 | < 1.5 | ||||||
Humidity (%) | < 3.0 | < 3.0 | < 3.0 | < 3.0 | < 3.0 | |||
Ignition loss (%) | < 6.0 | < 4.0 | < 6.0 | < 5.0 | < 6.0 | < 6.0 | < 5.0 | < 4.0 |
Specific surface area (m2/g) | > 15 | 15-35 | > 15 | > 15 | > 15 | > 15 | ||
Activity indicators (%) | > 105@7d | > 95@7d > 105@28d | > 85@28d | > 95@7d | > 85@7d | |||
Particle size ( 45um triage %) | < 10 | < 10 | < 10 | < 5.0 | < 10 | |||
The average particle size (%) | < 5 | < 5 | ||||||
Water requirement ratio (%) | < 125 |