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AEROSIL® R 974 is a hydrophobic fumed silica aftertreated with DDS (Dimethyldichlorosilane) based on a hydrophilic fumed silica with a specific surface area of 200 m2/g.
AEROSIL® R 974 is a hydrophobic fumed silica, after-treated with DDS (dimethyldichlorosilane) based on a hydrophilic fumed silica with a specific surface area of 200 m²/g, resulting in a finished BET surface area of 150–190 m²/g.
While AEROSIL® R 972 uses the same DDS surface treatment, R 974 is built on a higher-surface-area base material, giving it a broader application range that extends well beyond coatings — into silicone sealants, offset printing inks, and even cosmetics. Its larger surface area also improves thickening, thixotropic effect, and transparency versus lower-surface-area DDS grades.
Applications
Silicone rubber and silicone sealants
Paints and coatings
Negative toner
Adhesives
Coating polymers
Cosmetics
Hydrophobic component for thickening and reinforcement of RTV-1 pack silicone sealants
Improves shelf life of silicone sealants
Water resistant — for thickening and hydrophobizing of liquid systems
Rheology control of (complex) liquid systems
Used in coatings as an anti-settling agent, for pigment stabilization and improved corrosion protection
Improves hydrophobicity and rheology of offset printing inks
Improves and maintains free-flow and anti-caking characteristics of powders
Due to its large surface area, delivers improved thickening and thixotropic effect as well as transparency
Technical Data
| Properties and test methods | Unit | Value |
| Specific surface area (BET) | m²/g | 150 - 190 |
| pH value in 4% dispersion | - | 3.7 - 4.7 |
| Loss on drying* 2 hours at 105 °C | % | ≤ 0.5 |
| C content | % | 0.7 - 1.3 |
| Tamped density* modified | g/l | approx. 50 |
| SiO2 content based on ignited material | % | ≥ 99.8 |
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