Fumed Silica

The Concrete Protector’s Fumed Silica is a synthetic, amorphous, colloidal form of silicon dioxide widely used across multiple industries. This versatile thickening agent enhances viscosity in adhesives, sealants, coatings, cosmetics, pharmaceuticals, composites, elastomers, foods, and inks. Fumed Silica improves sag resistance, prevents settling, boosts anti-corrosive properties, enhances shelf stability, and provides mechanical reinforcement in epoxy coatings. It is also effective for strengthening silicone rubber and can be used to reinforce various types of organic rubbers.

Key Benefits:

• Thickens resins and epoxies for improved body and workability
• Colorless and clear when blended with liquids and polymers
• Provides anti-sag and anti-settling properties
• Helps suspend pigments, heavy active ingredients, and loads
• Versatile across a wide range of applications and industries

Physical Properties:

• Color: White (dry)
• Packaging: 10 lb bag
• Assay (% SiO2): >99.8%
• X-Ray Form: Amorphous
• Average Particle Length: 0.2–0.3 microns
• B.E.T Surface Area: 200 m²/g
• Specific Gravity: 2.2 g/cm³ (18.3 lb/gal)
• Bulk Density: 3.0 lb/ft³ max.
• pH (4% Aqueous Slurry): 3.7–4.3
• Refractive Index: 1.46
• 325 Mesh Residue: 0.02% max.

Limitations:

• Easy to produce temperature cracks in concrete if used improperly

How to Use:

1. Add a small amount of fumed silica to your resin (epoxy, etc.)
2. Using a low-speed mixer or spatula, blend thoroughly into the resin
3. Continue adding small amounts until your desired consistency is achieved