Hi-Sil T-700 Thixotropic silica PPG Industries Rheology Modifiers / Thickeners >> Mineral >> Synthetic Silica Polyesters ADHESIVE >> Solvent based SEALANT Hi-Sil® Thixotropic Silicas Hi-Sil® T-600 and T-700 are synthetic precipitated silica thixotropes used in a variety of coatings, resins, sealants and adhesive systems as rheology modifiers and anti-sag/suspension aids. Hi-Sil® T-700 Higher surface area thickener/thixotrope for solvent based coatings polyester gel coats, adhesives, caulks, sealants, inks, defoamers Synthetic, precipitated silica thixotrope. Used as a rheology modifier and an anti-sag/suspension aid in solvent based adhesives, caulks and sealants. Possesses high surface area.