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Hydrophobic fumed silica


AEROSIL® fumed silica—product groups


Physico-chemical data of hydrophobic fumed silica

Grades

BET surface area [m2/g]

Loss on drying [%]

pH value

Carbon content
[%]

AEROSIL® R 972

110 ± 20

≤ 0.5

3.6-5.5*

0.6-1.2*

AEROSIL® R 974

170 ± 20

≤ 0.5

3.7-4.7

0.7-1.3

AEROSIL® R 104

150 ± 25

≤ 1.5

4.0

1.0-2.0

AEROSIL® R 106

250 ± 30

≤ 0.5

3.7

1.5-3.0

AEROSIL® R 202

100 ± 20

≤ 0.5

4.0-6.0

3.5-5.0

AEROSIL® R 208

110 ± 10

≤ 0,5

4,5-6,5

4,5-6,5

AEROSIL® R 805

150 ± 25

≤ 0.5

3.5-5.5

4.5-6.5

AEROSIL® R 812

260 ± 30

≤ 0.5

5.5-8.0

2.0-3.0

AEROSIL® R 812 S

220 ± 25

≤ 0.5

5.5-9.0

3.0-4.0

AEROSIL® R 816

190 ± 20

≤ 1.0

4.0-5.5

0.9-1.8

AEROSIL® R 7200

150 ± 25

≤ 1.5

4.0-6.0

4.5-6.5

AEROSIL® R 8200

160 ± 25

≤ 0.5

5.0

2.0-4.0

AEROSIL® R 9200

170 ± 20

≤ 1.5

3.4-5.0

0.7-1.3

AEROSIL® R 711

150 ± 25

≤ 1.5

4.0-6.0

4.5-6.5

AEROSIL® RY 50

30 ± 15

≤ 0,5

4.5-7.5

3.0-4.0

AEROSIL® NY 50

30 ± 10

≤ 0,5

5.0-6.0

2.5-3.5

AEROSIL® NY 50 L

30 ± 10

n.a.

5.0-7.0

2.0-4.0

AEROSIL® RY 200

100 ± 20

≤ 0,5

4.0-7.0

3.5-5.5

AEROSIL® RY 200 S

80 ± 15

≤ 0,5

4.5-6.5

3.5-4.5

AEROSIL® RX 50

35 ± 10

≤ 0,5

6.0-8.0

0.5-0.75

AEROSIL® NAX 50

40 ± 10

≤ 0,5

6.0-8.0

0.45-0.85

AEROSIL® RX 200

140 ± 25

≤ 0,5

5.5-8.5

1.5-3.0

AEROSIL® RX 300

210 ± 20

≤ 0,5

6.0-8.0

3.0-5.0

AEROSIL® R 504

150 ± 25

≤ 1,5

8.5-10.5

2.0-4.0

AEROSIL® NX 90 S

65 ± 15

≤ 0.5

5.0-7.5

0.5-1.5

AEROSIL® NX 90 G

65 ± 15

n.a.

5.0-7.5

0.5-1.5

AEROSIL® RY 300

125 ± 15

≤ 0.5

4.5-5.5

6.0-8.0

AEROSIL® REA 90

55 ± 15

≤ 1.0

7.5-10.0

3.0-6.0

AEROSIL® REA 200

130 ± 20

≤ 1.0

8.0-10.0

5.0-7.5

AEROSIL® RY 51

15 - 40

≤ 0.5

4.5-8.5

5.0-7.0

AEROSIL® NA 50 Y

35 ± 10

≤ 0.8

6.5-9.0

2.0-4.0

AEROSIL® RA 200 HS

140 ± 20

≤ 0.8

8.0-10.0

≤ 3.0

AEROSIL® NA 50 H

40 ± 10

≤ 0.8

8.0-10.0

≤ 2.0

AEROSIL® RA 200 H

150 ± 25

≤ 1.5

8.5-11.0

2.0-4.0

AEROSIL® NA 130 K

105 ± 15

≤ 1.0

7.0-10.5

2.0-4.0

AEROSIL® NA 200 Y

125 ± 25

≤ 0.8

6.5-9.5

3.0-5.0

AEROSIL® NX 130

100 ± 15

≤ 0.5

5.0-7.5

1.0-3.0

AEROSIL® RY 200 L

100 ± 20

≤ 0.5

4.0-7.0

4.0-6.0

AEROSIL® R 709

35 ± 10

≤ 2.5

4.5-7.5

1.5-3.5

AEROSIL® R 976 S

240 ± 25

≤ 0.5

4.0-5.5

2.0-2.6

* Narrower range possible.

The data represents typical values.

Hydrophobic fumed silica

AEROSIL® grades

BET surface area [m2/g]

Chlorides [ppm]

Water-dispersible fraction [wt.%]

AEROSIL® R 972 Pharma

110 ± 20

≤ 250

≤ 3.0

Numerous grades of hydrophobic AEROSIL® fumed silica have been developed to solve particular technical problems. AEROSIL® hydrophobic fumed silica are produced by chemical treatment of hydrophilic grades with silanes or siloxanes. In the finished product the treatment agent is chemically bonded to the previously hydrophilic oxide. AEROSIL® hydrophobic products are characterized, among other things, by a low moisture adsorption, excellent dispersibility, and their ability to adjust rheological behavior, even that of polar systems.

AEROSIL® grades such as R 7200, R 8200 and R 9200 undergo additional structural modification which makes it possible to offer further support to our customers in the development and enhancement of their products. An example of this would be higher loading levels in liquid systems with little impact on viscosity.

Positive effects:

  • Optimum rheology during processing

  • Thickening of polar liquids, e.g. epoxy resins

  • Reinforcement of silicone elastomers

  • High levels of loading, e.g. molding compounds

  • Excellent water-repelling properties, leading to improved corrosion protection

  • Improvement of dielectric properties, e.g. in cable compounds

  • Free-flow of powders, e.g. in fire extinguishers

  • Increased scratch resistance, e.g. in paints and plastics