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DDS-Modified Hydrophobic Fumed Silica: Properties, Applications and Grade Selection Hydrophobic fumed silica is widely used to improve rheology, reinforcement, moisture resistance, and anti-settling performance in industrial formulations. Among different surface treatments, Dimethyldichlorosilane (DDS) modified fumed silica is a popular choice for applications requiring good hydrophobicity and reliable rheological control. What Is DDS-Modified Fumed Silica? DDS-modified fumed silica is produced by surface-treating fumed silica with dimethyldichlorosilane (DDS). The surface treatment reduces the hydrophilic character of the silica particles, improving their compatibility with moisture-sensitive and hydrophobic formulations. Compared with untreated hydrophilic fumed silica, DDS-modified grades generally provide better moisture resistance, dispersion behavior, rheology control, and anti-settling performance in suitable formulations. Key Properties DDS-modified hydrophobic fumed silica can provide several important functions: Hydrophobicity: Helps reduce moisture sensitivity in formulations. Rheology Control: Improves viscosity and thixotropic behavior. Reinforcement: Enhances the mechanical properties of selected polymer and silicone systems. Anti-Settling: Helps maintain stable dispersion of fillers and pigments. Processing Flexibility: Different surface-treatment levels and specific surface areas allow formulators to select a suitable grade. DDS Fumed Silica Grade Selection GESEESIL offers several DDS-modified hydrophobic fumed silica grades with different specific surface areas and carbon contents. Grade Specific Surface Area Carbon Content B210 120 ± 20 m²/g 0.5–1.0% B220 120 ± 20 m²/g 1.0–1.5% B221 120 ± 20 m²/g 1.5–2.0% B230 120 ± 20 m²/g 1.5–2.0% B231 120 ± 20 m²/g 2.0–2.5% In general, grades with higher specific surface area can provide stronger thickening, thixotropic, and reinforcing effects. B230 and B231 are suitable options when higher surface area and stronger rheological performance are required, while B210 and B220 can be considered for applications requiring a lower surface-area grade. B230 and B231 have the same target specific surface area, but B231 has a higher carbon content, providing a different surface-treatment profile for formulation optimization. Common Applications DDS-modified hydrophobic fumed silica is commonly used in: RTV silicone rubber Silicone sealants Adhesives Paints and coatings Electronic encapsulation materials Composites and specialty formulations The optimal grade and dosage depend on the base polymer, formulation composition, processing method, and required viscosity or thixotropy. Choose the Right DDS-Modified Fumed Silica Selecting the right grade is important for achieving the desired balance between hydrophobicity, viscosity, thixotropy, reinforcement, and dispersion. GESEESIL DDS-modified hydrophobic fumed silica is available in multiple grades to meet different formulation requirements. Contact us to discuss your application and find a suitable grade for your formulation.

As China celebrates its National Day, October 1 marks an important moment to reflect on the country’s role in global manufacturing and international trade. From raw materials and advanced chemicals to industrial equipment and finished products, Chinese manufacturing continues to support industries and supply chains around the world. For companies working with specialty materials, reliable access to high-quality raw materials is an important part of maintaining stable production. Fumed silica is one such material, with applications across silicone, adhesives, sealants, coatings, rubber, plastics, and other industrial sectors. Fumed Silica: A Versatile Industrial Material Fumed silica is a fine, high-purity form of silicon dioxide produced through a flame hydrolysis process. Its extremely small primary particles and high specific surface area give it unique properties that make it useful as a reinforcing, thickening, rheology-control, anti-settling, and free-flow agent. Different grades of fumed silica can provide different levels of surface area, structure, and surface chemistry. This allows manufacturers to select a suitable grade according to the requirements of their formulations. Hydrophilic fumed silica is commonly used in silicone rubber, sealants, coatings, adhesives, plastics, and chemical formulations. Hydrophobic grades, which are surface-treated with organosilicon compounds, can provide improved compatibility with organic systems and are widely used in silicone-based products, sealants, coatings, and electronic encapsulation materials. Supporting Global Manufacturing from China China has developed a broad industrial supply chain for chemical raw materials, giving international manufacturers access to a wide range of products and production capabilities. For overseas buyers, however, product availability is only one part of the sourcing process. Consistent quality, technical specifications, packaging, communication, and international logistics are also important when selecting a raw material supplier. At GESEE, we focus on providing industrial-grade fumed silica for customers in different markets. Our product range includes hydrophilic and hydrophobic grades designed for applications such as silicone rubber, sealants, adhesives, coatings, and other industrial formulations. We understand that customers may have different requirements for specific surface area, surface treatment, dispersion, reinforcement, and rheological performance. Therefore, product selection should always be based on the customer's formulation and processing conditions rather than simply choosing a grade based on a product name. Connecting Chinese Manufacturing with Global Customers International trade is built on long-term cooperation. For raw material suppliers, this means more than simply shipping products overseas. Clear technical communication, accurate documentation, stable supply, and responsive service can all contribute to a smoother purchasing experience. As a Chinese fumed silica supplier, GESEE is committed to serving customers worldwide and helping manufacturers find suitable silica solutions for their applications. This National Day, we are proud to be part of China's manufacturing and export community and to contribute, in our own way, to connections between Chinese suppliers and global industries. Happy China National Day 2026! For fumed silica inquiries, product specifications, samples, or application discussions, please contact GESEE. Email: yuki@geseetech.comWhatsApp: +86 15988449691