AEROSIL R 972 is a hydrophobized fumed silica from Evonik, aftertreated with DDS (dimethyldichlorosilane), with a BET surface area of 90-130 m²/g. For composite material buyers and coating formulators sourcing anti-settling, free-flow, and anti-caking additives, it is a reference grade used across coatings, adhesives, silicone rubber and sealants, and powder systems.
Key Technical Properties of AEROSIL R 972
According to Evonik’s official technical data sheet, this fumed silica grade is characterized by the following properties, which buyers should confirm against their own incoming-goods testing:
| Specific surface area (BET) | 90 – 130 m²/g |
| pH value (4% dispersion) | 3.6 – 5.5 |
| Carbon content | 0.6 – 1.2% |
| Loss on drying | ≤ 0.5% |
| SiO2 content | ≥ 99.8% |
| Tamped density | Approx. 50 g/l |
| Shelf life | 24 months (2 years) from date of manufacture |
| Packaging | Multi-layer 10 kg bags |
| CAS number | 68611-44-9 |
Why Buyers Choose This Effective Rheology Additive
Evonik lists the key effects of this grade as rheology control, reinforcement, anti-settling, free-flow, and anti-caking. The DDS surface treatment provides water resistance and hydrophobizing of liquid systems, which is important for buyers working with:
- Anti-settling performance that keeps pigments and fillers suspended during storage
- Free-flow and anti-caking improvement for powder systems
- Hydrophobizing and water resistance in liquid formulations
- Reinforcement in silicone rubber and sealant compounds
Why the DDS Treatment Matters
Because this product is surface-treated with DDS rather than left untreated, it behaves differently from hydrophilic AEROSIL grades. Buyers should test compatibility with their specific resin or liquid system, since hydrophobized silicas disperse and perform differently depending on polarity and processing conditions.
Typical Applications for AEROSIL R 972
Evonik’s product documentation names silicone rubber and sealants, adhesives, cosmetics, plant care, and coatings as typical applications for this grade. These applications are relevant to auxiliary agents used in composite and coating manufacturing:
- Silicone rubber and silicone sealants
- Adhesives and cable compounds
- Paints and coatings, printing inks, and toner formulations
- Powder systems requiring improved free-flow and anti-caking performance
Sourcing This Grade for Important Coating and Adhesive Applications
As a recommended international brand product, it is available through supply chain resource support for overseas buyers who need consistent hydrophobized fumed silica performance across production lots. Because the product’s rheological behavior depends on dispersion quality and compatibility with the target resin system, buyers sourcing this grade for coatings, adhesives, or sealant 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 product documentation before full-scale use.
FAQ
What is the BET surface area of AEROSIL R 972?
Evonik’s technical data sheet lists its specific surface area (BET) at 90 – 130 m²/g.
What surface treatment does AEROSIL R 972 have?
This grade is aftertreated with DDS (dimethyldichlorosilane), which hydrophobizes the fumed silica surface.
Is AEROSIL R 972 suitable for coatings and adhesives?
Yes, Evonik lists coatings and adhesives among the typical applications for AEROSIL R 972, alongside silicone rubber, sealants, and cosmetics.
How should AEROSIL R 972 be stored?
AEROSIL R 972 should be stored in closed containers under dry conditions, away from volatile substances, and should be used within 2 years (24 months) of production.
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 972 for your next coating, adhesive, or sealant formulation? Contact our team today with your application details and volume requirements, and we will help connect you with the right supply chain resources.
