FSA-300 is a hydrophilic fumed silica rheology control additive with a very high specific surface area of approximately 300 m²/g. It delivers extremely strong rheological efficiency, providing excellent anti-settling, anti-sagging, and corrosion resistance performance. After proper dispersion, it also offers high transparency, making it especially suitable for clear and high-performance coating systems.
| Properties | Unit | FSA-300 |
| SiO2 content (dry basis) | wt.% | ≥ 99.8 |
| Loss on drying | wt.% | ≤ 1.5 |
| pH (4% suspension) | - | 3.7-4.5 |
| Specific surface area (BET) | m²/g | 270-330 |
| Tamped density | g/l | Approx. 50 |
| Surface treatment | - | Hydrophilic (untreated) |
FSA-300 is particularly well suited for:
Wood coatings requiring strong sag control and clarity
Plastic coatings demanding high rheological efficiency
Waterborne coating systems needing high-performance rheology control
Solventborne coating systems needing high-performance rheology control
Radiation-curing coatings requiring stable, efficient structure build
1-pack and 2-pack coatings requiring strong rheology efficiency
Adhesives and sealants requiring strong thixotropy / non-slump behavior
Silicone rubber (HTV / LSR) for higher reinforcement/rheology efficiency
Cable compounds needing higher structure build
Unsaturated polyester resins where strong thixotropy is needed
Cosmetics as a rheology modifier (application-dependent)
Powder flow / anti-caking to improve free-flow and reduce caking of powders
