Fumed silica is the superfine micro-nano fine chemical product, which is divided into hydrophilic type and hydrophobic type in accordance with their different surface treatments.Its appearance is white powder.Native particle size ranges from 5nm to 40nm, with significant functions of thixotropy, reinforcing,thickening and filling.Therefore,it is widely used in the industries of rubber, sealant, plastic,resin,paint,printing ink,papermaking,medicine,cosmetics,food etc.
4.Sample: With Free
5.Specification:
1.1. Hydrophilic fumed silica
Grade
150
200
300
Form
powder
BET Specific Surface Area m2/g
150±15
200±15
300±20
Ph Value
3.8~4.2
Heating Loss(105℃,2h) wt%
≤1.5
Ignition Loss(1000℃,2h) wt%
≤2
SiO2
≥99.9%
Bulk Density g/l
40~60
1.2. Hydrophobic fumed silica
Grade
215
615
620
630
135
Form
powder
BET Specific Surface Area m2/g
110±20
170±20
170±20
230±25
110±15
Ph Value
3.7~4.5
3.7~4.5
5.5~8.0
5.5~8.0
5.5~7.5
Heating Loss(105℃,2h) wt%
≤0.5
≤0.5
≤0.5
≤0.5
≤1.5
Ignition Loss(1000℃,2h) wt%
≤2.5
≤2.5
≤4.0
≤4.0
≤10
SiO2
≥99.8%
Bulk Density g/l
40~60
Carbon content(based on material dried for 2h@105℃)
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