Our silica fume is produced in global main ferroalloy manufacturing area, that is in the east of Helan mountain crossed by Ningxia and Inner Mongolia province located in northwest of China, where is surrounded by high energy consuming industry chain. Because of high grade silica with less impurity as well as abundant coal and electricity, it has large production of ferro-silica and metallic silicon. And gathered silica fume is in steady quality and adequate supply.
According to grade of SiO2 , the silica fume is divided to 7 levels: Grade 85, Grade 88, Grade 90, Grade 92, Grade 94, Grade 95.
Grade 85
|
Chemical & Physical Analysis |
ASTM C1240-03 |
GB/T 21236-2007 |
|
SiO2 （%） |
＞85 |
≥85 |
|
C（%） |
|
≤2.5 |
|
CI（%） |
|
≤0.3 |
|
Moisture（%） |
＜3.0 |
≤3.0 |
|
L.O.I（%） |
＜6.0 |
≤6.0 |
|
Specific Surface （BET-m2/gram） |
＞15 |
≥15 |
|
Pozz. Activity Index （%） - 7 days accelerated curing |
＞105 |
|
|
Pozz. Activity Index （%） - 28 days normal curing |
|
≥85 |
|
Retained on 45 micron sieve （%） |
＜10 |
≤10.0 |
|
Variation from avg. retained on 45 micron （%-points） |
＜5 |
|
|
Water requirement ratio （%） |
|
≤125 |
Grade 88
|
Chemical & Physical Analysis |
ASTM C1240-03 |
GB/T 21236-2007 |
|
SiO2 （%） |
＞88 |
≥88 |
|
C（%） |
|
≤2.5 |
|
CI（%） |
|
≤0.2 |
|
PH value |
|
4.0-8.5 |
|
Moisture（%） |
＜3.0 |
≤3.0 |
|
L.O.I（%） |
＜6.0 |
≤4.0 |
|
Specific Surface （BET-m2/gram） |
＞15 |
≥15 |
|
Pozz. Activity Index （%） - 7 days accelerated curing |
＞105 |
|
|
Pozz. Activity Index （%） - 28 days normal curing |
|
≥85 |
|
Retained on 45 micron sieve （%） |
＜10 |
≤5.0 |
|
Variation from avg. retained on 45 micron （%-points） |
＜5 |
|
|
Water requirement ratio （%） |
|
≤125 |
Grade 90
|
Chemical and physical requirements |
GB/T 21236-2007 |
|
|
Item |
Spec. |
|
|
SiO2（%） |
＞90 |
≥90 |
|
Al2O3（%） |
|
≤1.5 |
|
Fe2O3（%） |
|
≤2.0 |
|
CaO＋MgO（%） |
|
≤2.0 |
|
K2O＋Na2O（%） |
|
≤2.0 |
|
C（%） |
|
≤2.0 |
|
CI（%） |
|
≤0.1 |
|
PH value |
|
4.0-8.5 |
|
Moisture（after packing）（%） |
＜1.0 |
≤2.5 |
|
L.O.I（%） |
＜3.0 |
≤3.0 |
|
Retained on 45 micron sieve （tested on Undensified, %） |
＜1.5 |
≤3.0 |
|
Specific Surface（m2/g） |
|
≥15 |
|
Pozz. Activity Index （%） - 28 days normal curing |
|
≥85 |
|
Water requirement ratio （%） |
|
≤125 |
|
Bulk Density - Undensified （when packed, kg/m3） |
200-350 |
|
|
Bulk Density - Densified （when packed, kg/m3） |
500-700 |
|
Grade 92
|
Chemical and physical requirements |
GB/T 21236-2007 |
|
|
Item |
Spec. |
|
|
SiO2（%） |
≥92 |
≥92 |
|
C（%） |
≤2.0 |
≤2.0 |
|
CI（%） |
|
≤0.1 |
|
Fe2O3（%） |
≤1.0 |
≤1.0 |
|
Al2O3（%） |
≤2.0 |
≤1.0 |
|
CaO（%） |
≤1.2 |
≤1.5 |
|
MgO（%） |
≤0.5 |
|
|
K2O（%） |
≤1.5 |
≤1.5 |
|
Na2O（%） |
≤0.5 |
|
|
Moisture（%） |
≤1.0 |
≤2.0 |
|
Loss on Ignition at 975 C |
≤3.0 |
≤3.0 |
|
Coarse Particles >45?m （325mesh） （%） |
≤1.0 |
≤3.0 |
|
PH value |
4.5-7.5 |
4.0-8.5 |
|
Specific Surface（m2/g） |
|
≥15 |
|
Pozz. Activity Index （%） - 28 days normal curing |
|
≥85 |
|
Water requirement ratio （%） |
|
≤125 |
|
Bulk Density（as packed） |
200-350kg/m3 U 500-700 kg/m3 D |
|
Grade 94
|
Analysis/Properties |
Value |
|
SiO2 Silicon Dioxide, Amorphous |
94%Min. |
|
Fe2O3 Iron Oxide |
0.19% Typical |
|
Al2O3 Aluminium Oxide |
0.27% Typical |
|
CaO |
0.26% Typical |
|
MgO |
0.49% Typical |
|
K2O Potassium Oxide |
0.50% Typical |
|
Na2O Sodium Oxide |
0.38% Typical |
|
P2O5 Phosphorus Pentoxide |
0.26% Typical |
|
MnO Manganese Oxide |
0.25% Typical |
|
TiO2 Titanium Oxide |
0.21% Typical |
|
Loss on Ignition |
2.88% Typical |
|
Coarse Particles >45?m （325mesh） |
1.2%Max. |
|
Bulk Density（as packed） |
200-350kg/m3 U 500-700 kg/m3 D |
Grade 95
|
Chemical and physical requirements |
GB/T 21236-2007 |
|
|
Item |
Spec. |
|
|
SiO2（%） |
≥95% |
≥95% |
|
Al2O3（%） |
0.21 |
≤1.0 |
|
Fe2O3（%） |
0.08 |
≤1.0 |
|
C（%） |
|
≤1.0 |
|
CI（%） |
|
≤0.1 |
|
CaO（%） |
0.11 |
≤1.0 |
|
MgO（%） |
0.21 |
|
|
K2O（%） |
0.32 |
≤1.0 |
|
Na2O（%） |
0.24 |
|
|
P2O5（%） |
0.09 |
|
|
MnO（%） |
0.035 |
|
|
TiO2（%） |
0.012 |
|
|
PH value |
|
4.5-7.5 |
|
L.O.I （%） |
2.63 |
≤1.0 |
|
Coarse Particles >45?m （325mesh） （%） |
≤1.2 |
≤2.0 |
|
Specific Surface（m2/g） |
|
≥15 |
|
Pozz. Activity Index （%） - 28 days normal curing |
|
≥85 |
|
Water requirement ratio （%） |
|
≤125 |
|
Bulk Density（as packed） |
200-350kg/m3 U 500-700 kg/m3 D |
|
Antiultraviolet and ageing resistance flexible freight bags-FIBC is adapted. Two types of 850KG and 900KG.
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