Cabot CAB-O-SIL TS-720 - PDMS-Treated Hydrophobic Fumed Silica, Anti-Sag & Anti-Settling Rheology Additive

Full Name: CAB-O-SIL TS-720 Polydimethylsiloxane Treated Medium Surface Area Hydrophobic Fumed Silica Medium-BET fumed silica modified with PDMS hydrophobic treatment, professional rheology control additive for medium & high polarity resin systems. Delivers thickening, anti-sag, anti-settling and shear-thinning property; minimizes moisture introduction to avoid premature crosslinking of moisture-cured PU & silicone sealants, widely used in adhesives, industrial coatings, composite gel coats and electronic potting materials Cabot Corp... . Core Technical Parameters BET Nitrogen Specific Surface Area 100±20 ㎡/g Primary Particle Size 102 cc/100g Carbon Content 88 cc/100g pH Value (4% Aqueous Dispersion)  3.7–4.7 Loss on Ignition (1000℃) ≤7.0 % Bulk Density ~50 g/L Physical Form Ultra-fine white fluffy powder Standard Pack 10kg/moisture-proof paper bag; 25kg fiber drum optional SiO₂ Purity ≥99.8% Standard Pack  20kg/bag, 12.5kg small pack available CAS No. 67762-90-7 Core Advantages Permanent PDMS hydrophobic modification, ultra-low water absorption (≤0.5%), greatly suppress premature crosslinking of moisture-sensitive PU, MS, silicone sealant systems and extend shelf life Alibaba.co... . Excellent thickening & thixotropic efficiency, low addition brings obvious anti-sagging performance, supports high film build coating construction without vertical sagging. Powerful anti-settling capacity, stably suspend heavy metal pigments, aluminum paste, zinc powder and mineral fillers to avoid precipitation & stratification during long-term storage. Ideal shear-thinning rheology: high viscosity under static state for anti-sag, low viscosity under high shear for smooth spraying, brushing & extrusion construction. Fast structural recovery after shearing, stable long-term rheology without gradual viscosity fading for multi-component epoxy & vinyl ester resin systems. High purity without metal ion impurity, compatible with electronic encapsulation, food-contact coating auxiliary systems and meets REACH compliance requirements. Good dispersion in epoxy, PU, vinyl ester, UV resin, solvent-based coatings; low grinding energy demand with ordinary high-speed disperser. Main Application Fields Core Applications: Moisture-cured PU/MS sealant, two-component epoxy adhesive, industrial anti-corrosion coating, composite gel coat & laminating resin, electronic potting compound Compatible Applications: UV printing ink, silicone elastomer reinforcement, metal zinc-rich primer, wood varnish, polyester putty, automotive repair coating Forbidden Scenarios: Aqueous 100% waterborne coating without co-solvent, strong hydrofluoric acid system, high-temperature sintering ceramic slurry Handling Precautions Standard addition dosage for most resin systems: 0.5% ~ 3.0% by total weight; increase to 2.5–3.5% for high anti-sag heavy primer formulas. Adopt high-speed dispersion + medium sand milling for full dispersion; insufficient dispersion will weaken thickening and anti-settling performance obviously. Sealed storage in cool dry warehouse, strictly isolate moisture, strong alkali & hydrofluoric acid to prevent surface modification failure and agglomeration. Feeding workshop must equip dust removal & anti-static grounding devices to avoid ultra-fine silica dust floating and static risks. For one-component moisture-cured sealant, add TS-720 before moisture blocking agent to fully reduce residual water inside the system.