Hydrophobic Fumed Silica is organo‑modified fumed silica serving as direct replacement for AEROSIL R972. After homogeneous dispersion within resin systems, the silica particles build a reversible physical network. It delivers effective thixotropic and anti‑sag performance for solvent‑borne coatings, sealants and adhesives, prevents sagging on vertical surfaces, and enhances water‑resistance of cured finished products.

Product Detail

Product Overview Hydrophobic Fumed Silica (CAS 112945‑52‑5, AEROSIL R972 Equivalent) is fumed silica treated with organosilane to obtain hydrophobic surface property. When subjected to high‑shear dispersion in solvent‑containing resin, fine primary particles form a fragile reversible network. Under static conditions, this network increases system viscosity to realize anti‑sag and anti‑settling effects on vertical coating and sealant surfaces. Once mechanical shear is applied during application, viscosity drops for convenient brushing, spraying or extrusion. The hydrophobic modification reduces moisture uptake, which is beneficial for moisture‑sensitive polyurethane sealant formulations. This fumed silica is widely used in solvent‑based industrial coatings, epoxy adhesives and polyurethane construction sealants.

Key Features ‑ Reversible thixotropic network offers reliable anti‑sag and anti‑settling performance ‑ Viscosity drops under shear, good workability during spraying, brushing and extrusion ‑ Hydrophobic surface treatment with low water absorption, suitable for moisture‑curing resin systems ‑ Excellent compatibility with non‑aqueous solvent‑borne resin formulations ‑ Direct functional equivalent grade for AEROSIL R972 hydrophobic fumed silica

Typical Technical Properties ‑ Chemical Type: Organo‑modified hydrophobic fumed silica ‑ Appearance: White ultra‑fine light‑weight powder ‑ BET Surface Area: Refer to TDS ‑ Bulk Density: Refer to TDS ‑ Carbon Content: Refer to TDS

Applications ‑ Solvent‑borne industrial coating: Anti‑sag rheology additive for vertical topcoat and primer ‑ Polyurethane sealant: Rheology modifier for construction and industrial PU sealant ‑ Epoxy adhesive: Thixotropic thickening additive for two‑component epoxy systems ‑ Chemical compounding plant: Raw rheological silica for non‑aqueous adhesive‑sealant production

Processing Recommendation Carry out high‑speed shear dispersion to achieve full de‑agglomeration of fumed silica. Avoid insufficient dispersion which may leave micro‑agglomerates. Control dispersion temperature properly. Perform lab rheology testing to confirm dosage before mass production of coatings or sealants.

Storage & Handling Store in cool, dry warehouse, tightly protect against humidity. Reseal packaging promptly after opening. Wear dust‑proof mask and protective gloves when handling ultra‑fine silica powder.

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Hydrophobic Fumed Silica CAS 112945-52-5 Thixotropic Anti-Sag Coating Sealant Additive

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Jishengya Technology

Shenzhen Jishengya Technology Co., Ltd. is located in Shenzhen, a special economic zone, and is a comprehensive technology enterprise integrating independent R&D, production and sales.