Cabot CAB-O-SIL Untreated Fumed Silica

CAB-O-SIL M-5 Untreated Fumed Silica is a high-purity, synthetic amorphous silicon dioxide engineered through flame pyrolysis. This process creates a light, fluffy white powder with extremely small primary particles and a highly branched three-dimensional structure. These properties give it a large surface area and make it exceptionally effective in improving rheology, enhancing suspension stability, and preventing caking or clumping in complex formulations.

Commonly used across industrial and commercial sectors, CAB-O-SIL M-5 performs reliably in applications ranging from adhesives and sealants to pharmaceuticals and personal care products. Its unique ability to modify viscosity and provide thickening, anti-settling, and free-flow performance makes it a go-to additive for formulators seeking high-performance results.

Available in bulk packaging at discounted rates — ideal for manufacturers sourcing at scale.

📦 Packaging 

• 10 lb bag (standard)

• Pallet and truckload options available upon request

🔍 Key Features

• High Purity: Low impurity content from flame pyrolysis manufacturing

• Small Particle Size: Ranges from 5–50 nanometers; high surface area of 50–600 m²/g

• Versatile Functionality: Thickening, anti-settling, and flow-enhancing performance

• Broad Compatibility: Works with adhesives, sealants, coatings, composites, cosmetics, food-grade materials, and pharmaceuticals

Industry Applications:
CAB-O-SIL M-5 Untreated Fumed Silica is trusted by manufacturers across a wide range of industries. In coatings and paints, it prevents sagging and settling. In sealants and adhesives, it enhances shear-thinning behavior for smoother application. It’s also frequently used in pharmaceutical and cosmetic formulations for its ability to stabilize emulsions and improve texture without altering active ingredients. Its non-toxic, odorless profile makes it an ideal choice for sensitive or regulated applications.