CAB-O-SIL® TS-720 is a medium surface area fumed silica which has been surface modified with polydimethylsiloxane. The treatment renders it extremely hydrophobic, with very different properties than untreated silica.

CAB-O-SIL TS-720 is characterized by:

• High purity
• Aggregate structure
• Submicron particle size
• Low bulk density
• Hydrophobic surface chemistry

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Application Information:

CAB-O-SIL TS-720 is Cabot's most hydrophobic treated fumed silica making it an excellent choice for moisture sensitive systems. Further the surface chemistry of TS-720 makes it very effective, stabile rheology control additive for polar systems.

Epoxy Adhesives and Coatings:

In epoxy adhesives and coatings, TS-720 provides good thickening efficiency, sag resistance (for film build) and anti-settling of pigments and fillers. While untreated fumed silica may also provide the similar rheology control initially, only TS-720 provides stable rheological properties over time. For applications requiring storage stability, TS-720 is recommended.

Polyurethane Adhesive and Coatings:

In polyurethane adhesives and coatings, TS-720 provides the same stable rheology control as in epoxy systems. In addition, the hydrophobic surface of TS-720 introduces very little moisture into these systems, preventing premature cross-linking of moisture cured systems.

Vinyl Ester Resins:

CAB-O-SIL TS-720 is used for rheology control of vinyl ester laminating resins and bonding pastes. While untreated fumed silica are effective thickeners of unsaturated polyester resin laminating resins, gel coats, and bonding pastes, TS-720 is a more effective rheology control additive for higher polarity systems like vinyl esters.