Chemical composition of silica fume in the world

Chemical composition of silica fume in the world

Chemical composition of silica fume in the world:

Physical and chemical propertiesUnited StatesEuropeCanadaJapanChinaBrazilSouth KoreaItaly
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)> 1515-35> 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

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