Chemical composition of silica fume in the world

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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