AEROSIL R 974 is a hydrophobic fumed silica from Evonik, after-treated with DDS (dimethyldichlorosilane), with a BET surface area of 150-190 m²/g. Universally applicable with good dispersibility and transparency, it is a reference grade for composite material buyers and coating formulators sourcing anti-settling, anti-sagging, and corrosion-resistance additives.
Key Technical Properties of AEROSIL R 974
According to Evonik’s official coating-additives technical data sheet, this grade is characterized by the following properties, which buyers should confirm against their own incoming-goods testing:
| Specific surface area (BET) | 150 – 190 m²/g |
| Carbon content | 0.7 – 1.3% |
| Loss on drying | < 0.5% |
| pH value | 3.7 – 4.7 |
| SiO2 content | > 99.8% |
| Tamped density | Approx. 50 g/l |
| Recommended addition level | 1.0 – 2.0% of total formulation |
| Shelf life | 24 months from date of manufacture |
| CAS number | 68611-44-9 |
Why Buyers Choose This Effective Rheology Additive
Evonik’s technical data sheet lists the key effects of this grade as anti-settling, anti-sagging, and corrosion resistance, alongside good dispersibility and transparency. These properties are important for buyers working with:
- Anti-settling performance that keeps pigments and fillers suspended during storage and transport
- Anti-sagging control for vertical application in coatings and paints
- Corrosion resistance support in protective coating formulations
- Sufficient dispersibility and good transparency across waterborne and solventborne systems
Suitability Across Coating Systems
Per Evonik’s suitability matrix, AEROSIL R 974 is suitable for waterborne, solventborne, radiation-curing, 1-pack coating, and 2-pack coating systems, which is important for buyers formulating across multiple product lines without switching additives.
Typical Applications for AEROSIL R 974
Evonik names general industrial coatings, coil coatings, car OEM coatings, and plastic coatings as typical applications. These applications are relevant to auxiliary agents used in composite and coating manufacturing:
- General industrial coatings
- Coil coatings
- Car OEM coatings
- Plastic coatings
Sourcing This Grade for Important Coating Applications
As a recommended international brand product, AEROSIL R 974 is available through supply chain resource support for overseas buyers who need consistent hydrophobic fumed silica performance across production lots. Addition to the coating is possible either as supplied or as a predilution. Because rheological behavior depends on dispersion method and compatibility with the target resin system, buyers sourcing this grade for industrial or OEM coating formulations should request a current certificate of analysis for each shipment and verify BET surface area, carbon content, and loss-on-drying figures against Evonik’s official technical data sheet before full-scale use.
FAQ
What is the BET surface area of AEROSIL R 974?
Evonik’s technical data sheet lists the specific surface area (BET) at 150 – 190 m²/g.
What surface treatment does AEROSIL R 974 have?
AEROSIL R 974 is after-treated with DDS (dimethyldichlorosilane), which gives the fumed silica hydrophobic properties.
Which coating systems is AEROSIL R 974 suitable for?
Evonik lists it as suitable for waterborne, solventborne, radiation-curing, 1-pack, and 2-pack coating systems.
What is the recommended addition level?
Evonik recommends an addition level of 1.0-2.0% calculated on the total formulation, added as supplied or as a predilution.
How can I request a quote or sample?
Contact our team with your target application and required volume, and we will provide sourcing and supply chain resource support based on current availability.
Looking to source AEROSIL R 974 for your next industrial, coil, or OEM coating formulation? Contact our team today with your application details and volume requirements, and we will help connect you with the right supply chain resources.
