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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