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Fumed Silica (White Carbon Black)
 

 
Feature
Fumed silica (commonly known as fumed white carbon black) which is made through using chlorosilane with pyrohydrolysis in oxyhydrogen flame, is a kind of white amorphous inorganic fine chemical products without poison and taste. By adjusting technological conditions, fumed silica product can be produced, whose primary particle size is from 7nm to 40nm, and whose specific surface area is form 50m2/g to 400m2/g. Due to its small particle size, large specific surace area and strong surface activity, its widely used in rubber, coatings, adhesives, paints, inks, plastics, cosmetics, agriculture, medicine and other fields. It has so many functions, such as reinforcing, thickening, thixotropic, matting, uvioresistant, fungiciding and so on.
Physical indicators

Fineness

Specific surface area (BET)

Suspension PH value(4%)

Loss on drying (Drying in condition of 105℃ for 2h) (m/m%)

Loss on ignition (Basing on outcome of drying in condition of 105℃ for 2h, it needs firing in condition of 1000℃ for 2h) (m/m%)

Residue on sieve (45um) (m/m%)

Packed density (Basing on the outcome of drying in condition of 105℃ for 2h) (g/L)

Silica content(Basing on fired outcome) (m/m%)

Carbon content (Basing on the outcome of drying in condition of 105℃ for 2h) (m/m%)

CT-617 (hydrophobic)

170

5.0~8.0

≤0.5

≤4.0

---

45

≥99.8

≤0.2

CT-612 (hydrophobic)

115

5.0~8.0

≤0.5

≤2.5

---

45

≥99.8

≤0.2

CT-380

380

3.7~4.5

≤2.5

≤0.04

≤0.04

40-60

≥99.0

≤0.2

CT-200

200

3.7~4.5

≤1.0<

≤2.5

≤0.04

40-60

≥99.0

≤0.2

CT-150

150

3.7~4.5

≤1.0

≤2.5

≤0.04

40-60

≥99.0

≤0.2

Application of Fumed Silica in Polymer Industry
1.Rubber
It can helps rubber to increase intensity to 40 times at most and increase modulus of yield point to about 10 times. Elongation and croop property can both get improved outstandingly. Its reinforcement reaches carbon black completely, and it also avoids black pollution of carbon black.
2. Sealant and adhesive
It can be used as thickener and thixotropic agent, which increases the bonding strength and insures free mobility. It possesses the ability of anti-caking, sagging, loose collapse and depression during solidification, and keeps transparent.
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