AEROSIL R 106 is a hydrophobic fumed silica from Evonik, surface-treated with D4 (octamethylcyclotetrasiloxane) and especially recommended for 2-pack epoxy resin systems. For composite material buyers and coating formulators sourcing anti-sag, anti-settling, and pseudoplastic rheology additives, it is a reference grade used across protective coatings, marine coatings, and silicone rubber and sealant applications.
Key Technical Properties of AEROSIL R 106
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) | 220 – 280 m²/g |
| pH value (5% in water) | ≥ 3.7 |
| Carbon content | 1.5 – 3.0% |
| Loss on drying | max. 0.5% |
| Delivery form | Free-flowing powder |
| Tamped density | Approx. 50 g/l |
| Recommended addition level | 1.0 – 2.0 wt-% of total formulation, as supplied |
| Shelf life | 24 months from date of manufacture |
| CAS number | 112926-00-8 |
Why Buyers Choose This Fumed Silica for Epoxy and Protective Coating Systems
Evonik highlights that this grade is especially recommended for 2-pack epoxy resins and provides pseudoplastic (shear-thinning) flow behavior with an excellent rheology effect. In coating systems specifically, it is documented to deliver:
- Anti-settling performance that keeps pigments and fillers suspended during storage
- Anti-sagging control that helps formulations hold film thickness on vertical surfaces
- Support for corrosion resistance in protective coating formulations
- Pseudoplastic, shear-thinning flow suited to 2-pack epoxy resin systems
Suitability Across Coating Systems
Per Evonik’s technical data sheet, AEROSIL R 106 is positioned across waterborne, solventborne, radiation-curing, one-pack, and two-pack coating systems, with suitability levels that vary by system. Addition to the coating is possible as supplied, preferably at the grinding stage, and buyers should confirm compatibility with their specific base resin before moving to production scale-up.
Typical Applications for AEROSIL R 106
Evonik’s product documentation names protective coatings and marine coatings as typical applications, with the product also used as a reinforcing component for RTV and HTV silicone rubber and as a thickening agent for RTV-1K silicone sealants. These applications are relevant to auxiliary agents used in composite and coating manufacturing:
- Protective coatings and marine coatings
- 2-pack epoxy resin systems
- RTV- and HTV-silicone rubber as a reinforcing component
- RTV-1K silicone sealants as a thickening agent
- Rheology control of binders and polymers, and free-flow/anti-caking of powders
Sourcing This Fumed Silica Grade for Marine and Epoxy Coating Formulations
As a recommended international brand product, AEROSIL R 106 is available through supply chain resource support for overseas buyers who need consistent hydrophobic fumed silica performance across production lots. Because the product’s rheological behavior depends on dispersion quality and addition level, buyers sourcing this grade for epoxy, marine, or protective 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 product documentation before full-scale use.
FAQ
What is the BET surface area of AEROSIL R 106?
Evonik’s technical data sheet lists the specific surface area (BET) of AEROSIL R 106 at 220 – 280 m²/g.
Is AEROSIL R 106 suitable for 2-pack epoxy resin systems?
Yes, Evonik specifically highlights that AEROSIL R 106 is especially recommended for 2-pack epoxy resins, among its key benefits.
What is the recommended addition level for this product?
Evonik recommends an addition level of 1.0 – 2.0 wt-% of total formulation, as supplied, added preferably at the grinding stage.
How should AEROSIL R 106 be stored?
AEROSIL R 106 should be stored in its original unopened packaging under dry conditions, away from volatile substances, and has a shelf life of 24 months from the date of manufacture.
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 106 for your next epoxy, marine, or protective 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.
