Product description Hydrophobic fumed silica is a functional nano-powder prepared through the fumed-phase process (high-temperature hydrolysis of silicon tetrachloride in an oxy-hydrogen flame), surface-modified with specialized silane compounds. It strictly complies with industry standards, ISO 1248-2019 international specifications, and EU REACH regulatory requirements. Zhonglian Hydrophobic Fumed Silica features ultra-high purity (over 99.8%), nanoscale native particle size (7-40nm), three-dimensional network-like aggregation structure (specific surface area 50-400 m²/g), and exceptional hydrophobicity (water contact angle ≥120 °N·s, moisture absorption ≤0.5%). This material delivers core functionalities including thickening, thixotropy enhancement, anti-settling, anti-sagging, reinforcement, and scratch resistance in adhesive and paint systems. With outstanding chemical stability and dispersion properties, it adapts to various production systems such as solvent-based, solvent-free, and water-based formulations, particularly meeting high-end products' stringent demands for performance consistency and reliability. 2. Table parameters parameter detailed information product name Hygroscopic gas phase silica surface White fluffy nano powder Original particle size 7-40nm (can be precisely adjusted according to application scenarios) Silica content ≥99.8% (dry basis) pH price 3.8-5.5 loss on drying ≤5%（105℃/2h） specific area 50-400m²/g (BET method) surface modification agent Dimethyl dichlorosilane, hexamethyldisilazane and so on (Customizable modification type) hydrophobicity Water contact angle ≥120°,24h static water absorption rate ≤0.3% stacking density 40-120g/L (low bulk density, easy to disperse and mix) Heavy metal content Lead ≤3mg/kg, arsenic ≤1mg/kg, cadmium ≤1mg/kg dispersity In the epoxy resin, stir at 2000r/min for 20min, and the dispersion uniformity is more than 99.5% (no visible agglomeration) Thickening and thixotropy Add 1.5% to polyurethane adhesive, viscosity increased by 300%-800%, thixotropic index (TI) ≥5.0 Non-sinkability Add 2% to the solvent-based anticorrosion paint, no obvious stratification after 48h, pigment sedimentation amount ≤0.5% pack 10kg valve pack date of delivery Conventional model 5-10 days, customized modified/ high specific surface area model 15-22 days sample Free (≤100g) productive power Special production line for 6,000 tons/year of hydrophobic gas phase silica 3. Application description Zhonglian hydrophobic gas phase silica provides multi-dimensional performance improvement solutions for the core production needs of adhesives, paints and coatings through nanostructure and hydrophobic modification advantages. The specific application value is as follows: 1. Adhesive Reinforcement: Add 1%-2% epoxy resin to enhance viscosity and prevent sagging, while increasing shear strength by 20%-40%. Maintain ≥85% strength after 1000 hours of aging at 85℃/85% RH. Solvent-free polyurethane adhesive resists moisture and prevents bubbling, making it suitable for high-precision applications like new energy battery tab bonding. 2. Paint Optimization: For solvent-based industrial coatings, add 1.5%-3% to prevent pigment sedimentation (no hard sediment after 72h of standing). For water-based wood coatings, enhance water resistance (resistant to boiling water for 2h without wrinkling) and scratch resistance (HB pencil hardness → 2H). Transparency reduction ≤1.5%. UV-curable coatings are compatible with 3C enclosures, withstanding 300℃C heat while maintaining thixotropic stability. 3. Multi-field adaptability: Add 2%-3% of sealant to increase tensile modulus and elastic recovery rate (≥90%), prevent failure due to hot/cold cycle; fill the interface void in composite materials, improve bending strength by 15%-25%; improve waterproof performance (IPX6) and enhance delicate skin texture in cosmetics. 4. Multi-system Compatibility: Compatible with solvent-based, solvent-free, and water-based systems. The automotive OEM paint uses low specific surface area models (50-100 m²/g) with haze ≤3%; wind turbine blade adhesives employ high specific surface area models (300-400 m²/g) featuring strong thixotropic reinforcement for-40℃ to 80℃ environmental resistance. 4. Factory advantages •Customized technical capability: the type of surface modifier and specific surface area parameters can be customized according to customers' specific application scenarios. For example, low activation energy modified models are developed for low temperature curing adhesives to ensure stable thixotropic performance at low temperature (-10℃); •Advanced production technology: The automatic closed-loop gas phase production line is adopted, and the temperature control accuracy of hydrogen and oxygen flame is ±5℃ to ensure the uniformity of original particle size. The surface modification adopts fluidized bed continuous modification process, and the coating uniformity of modifier is more than 98% to avoid the performance fluctuation caused by local hydrophilicity; •Extensive experience in industry application: it has provided customized products for domestic top adhesive enterprises, coating enterprises and international chemical enterprises, suitable for new energy, automobile, electronics, building materials and other 18+ categories of subdivisions, exported to Europe, North America, Southeast Asia and other 30 countries and regions. 5. Packing for shipment •Standard packaging: 10kg valve bag, each bag is equipped with a one-way exhaust valve, and at the same time, moisture and dust are isolated; •Storage and transportation requirements: store in a cool, dry and ventilated place (relative humidity ≤40%), avoid mixing with strong acid and alkali, oxidizer, shelf life 165 months; non-hazardous chemical, support sea and international air transport, provide air transport identification report; •Label specification: each package shall be marked with product name, specifications (specific surface area, type of modifier), production batch number, shelf life, storage conditions, and other information. Export orders can be labeled with English/multilingual logo.