Undensified microsilica factory

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85% Undensified Silica Fume

Bulk Density:300-350kg/m3
SiO2: 88% – 97%min
500kgs/jumbo bag, 25kg/PP bag, or as customer’s request


Micro silica ,also called silica fume or micro silica, is a byproduct of production silicon metal or ferrosilicon alloys. Silicon metal and alloys are produced in electric furnaces.The raw materials are quartz,coal and woodchips.The smoke that results from furnace operation is collected and sold as silica fume, silica fume consists primarily of amorphous(non-crystalline) silicon dioxide(SiO2),its average granule diameter is 0.15~0.20um,specific surface area is 15000~20000m2/kg,and it has extremely strong surface active.

Undensified microsilica Test data:

Test Item Standard Result Standard Result Standard Result Standard Result
SF85 SF90 SF94 SF96
SiO2(%) 85%min 87.94% 90%min 92.21% 2.0%max 95.46% 2.0%max 97.68%
Fe2O3(%) 2.0%max 0.47% 2.0%max 0.57% 2.0%max 0.04% 2.0%max 0.02%
Al2O3(%) 2.0%max 0.42% 2.0%max 0.51% 2.0%max 0.27% 2.0%max 0.18%
CaO(%) 2.0%max 0.51% 2.0%max 0.64% 2.0%max 0.11% 2.0%max 0.05%
Na2O3(%) 2.0%max 0.63% 2.0%max 0.58% 2.0%max 0.41% 2.0%max 0.10%
Moisture(%) 2.0%max 0.50% 2.0%max 0.74% 2.0%max 0.34% 2.0%max 0.38%
Loss on Ignition(%) 3.0%max 2.43% 3.0%max 1.47% 3.0%max 1.42% 3.0%max 1.01%
Bulk Density


550-700kg/m3 650kg/m3 550-700kg/m3 650kg/m3 550-700kg/m3 650kg/m3 550-700kg/m3  650kg/m3
Bulk Density


300-380kg/m3 330kg/m3 300-380kg/m3 330kg/m3 300-380kg/m3 330kg/m3 300-380kg/m3 330kg/m3
Particle Size


99.00%min 99.67% 99.00%min 99.87% 99.00%min 99.89% 99.00%min 99.98%

Undensified microsilica factory:

Undensified microsilica factoryUndensified microsilica factory


Bulk silica fume can be stored in ordinary cement silos and transported in bulk bag or cement tankers. It can be moved into cement storage silos and then handled with normal automated batching systems.