Key characteristics

Physical Form‌: White, fluffy, nanoporous powder with low bulk density.
Particle Structure‌: Primary particles (7–40 nm) fuse into branched, chain-like aggregates, forming a three-dimensional network .
Surface Properties‌: High specific surface area (100–400 m²/g), rich in surface silanol groups (Si−OH), enabling strong hydrogen bonding .
Purity‌: ≥99.8% SiO₂ content, minimal metallic impurities .

Core Properties & Functions‌

Thixotropy‌: Forms reversible gel networks in liquids, preventing sedimentation and sagging in coatings/adhesives .
Reinforcement‌: Enhances tensile strength and abrasion resistance in silicone rubber and plastics .
Rheology Control‌: Acts as anti-settling agent in paints, inks, and cosmetics .
Chemical Stability‌: Inert to most solvents, acids (except HF), and bases;   thermally stable up to 1,750°C .

Primary Applications‌

Rubber & Elastomers‌: Critical reinforcing filler for silicone rubber, improving mechanical properties .
Coatings & Inks‌: Provides anti-sagging, viscosity control, and matting effects (e.g., in automotive paints) .
Pharma & Cosmetics‌: Flow aid in powders;   texturizer in foundations and lipsticks .
Industrial Chemistry‌: Carrier for catalysts;   additive in sealants and thermal insulation materials .

Technical Notes‌

Hydrophilic vs. Hydrophobic‌: Untreated fumed silica is hydrophilic;   surface modification (e.g., with silanes) yields hydrophobic grades for moisture-sensitive applications .
CAS Number‌: 7631-86-9 .
Safety‌: Non-toxic, compliant with food-contact (GB 9685) and pharmaceutical standards (USP/EP) .

This nanomaterial serves as a multifunctional additive across industries due to its unique structure and performance versatility .

Package: 10kg/bag