Fumed Silica[4]
Overview
Fumed silica powder, also known as pyrogenic silica, is a synthetic form of silicon dioxide produced by the vapor-phase hydrolysis of silicon tetrachloride in a flame of hydrogen and oxygen. This process yields a high-purity, ultra-fine powder with a large surface area and excellent rheological properties. Due to its unique structure, fumed silica is widely used as a thickening, thixotropic, and reinforcing agent in various industrial applications. Its ability to modify viscosity and improve mechanical properties makes it indispensable in sectors such as adhesives, coatings, and composites.
Physical and Chemical Properties
Fumed silica powder is characterized by its white, fluffy appearance and extremely fine particle size, typically in the nanometer range. It has a high surface area, often exceeding 200 m²/g, which contributes to its exceptional adsorption and thickening capabilities. The material is chemically inert, thermally stable, and insoluble in water and most organic solvents. Its low bulk density and high porosity make it lightweight yet effective in modifying the flow properties of liquids and pastes. These properties are leveraged in formulations requiring precise control over viscosity and sag resistance.
Main Applications
Fumed silica powder is a versatile additive used across multiple industries. In adhesives and sealants, it acts as a thickening and anti-settling agent, improving application properties and bond strength. In coatings, it enhances rheology, preventing dripping and sagging while maintaining a smooth finish. The pharmaceutical and cosmetic industries utilize fumed silica as a flow aid and anti-caking agent in powders and tablets. In composites, it reinforces mechanical properties and reduces shrinkage. Additionally, it serves as a desiccant and filler in specialty chemicals, demonstrating its broad utility in high-performance formulations.
Safety and Storage
While fumed silica is generally considered non-toxic, its fine particle size poses inhalation risks, necessitating the use of dust masks and proper ventilation during handling. Prolonged exposure to airborne particles should be avoided to prevent respiratory irritation. Storage conditions are critical to maintaining the powder's effectiveness. It should be kept in a cool, dry environment, sealed tightly to prevent moisture absorption. Incompatibility with strong acids and bases should also be considered, as reactions may alter its properties. Proper labeling and handling procedures ensure safe usage in industrial settings.
B2B Procurement Guide
When procuring fumed silica powder, B2B buyers should prioritize suppliers with certifications such as ISO 9001, ensuring consistent quality and reliability. Key specifications to verify include purity (typically ≥ 99.8%), particle size distribution, and surface area, as these directly impact performance in end-use applications. Bulk purchasing often reduces costs, but storage capacity and shelf life must be evaluated. Buyers should also consider surface-treated variants (e.g., hydrophobic fumed silica) for specialized applications. Requesting samples for testing and evaluating supplier technical support can aid in selecting the optimal product for specific formulation needs.
Related Manufacturers
- 主营：气相法氧化铝、彩色路面胶、透水路面胶、板材粘接胶
- 主营：气相二氧化硅、防螨助剂、树脂油墨稀释剂
- 主营：对辊机、低温粉碎、马赛克陶瓷、气流分级机、气流粉碎机、高速混合机、气流分级系统、气流粉碎系统、高速混合系统机
- 主营：二氧化硅、乳化剂、分散剂、气相二氧化硅、防水防油剂
- 主营：二氧化硅、乳化剂、消泡剂、气相法二氧化硅、分散剂、润湿剂、增稠剂、树脂、抗氧剂、杀菌防腐防霉剂、uv单体
- 主营：白炭黑、磁粉、水处理磁粉、方解石粉、硅灰、硅酸铝粉、硅藻土、蒙脱石粉、石英粉、钛白粉、萤石粉、竹炭粉、二氧化硅、饲料脱霉剂蒙脱石、微硅粉、氟化钙
- 主营：气相二氧化硅、石油树脂、聚异丁烯
- 主营：气相二氧化硅、氧化铬绿
- 主营：氧化铝、镍铁粉、钨铁粉、白铅粉、氧化硼、锰铁粉、硅铁粉、二氧化锆、氧化钛粉、球形磁粉、雾化铜粉、钒铁粉末、氧化铋粉、钛铁合金、三氧化钼、氧化镁粉、三氧化二、氧化钴粉、耐火材料、二硫化钨、氧化铬绿、纳米氧化钛、纳米氧化锌、球形磁铁粉、四氧化三铁
- 主营：氧化铁颜料、石墨、托玛琳球、气相法二氧化硅、电气石、硅藻土
- 主营：wcat-wh02、粘接剂、密封胶、降粘剂、聚氨酯、耐磨剂、水解剂、补强剂、bcat-e28b、改性剂、消泡剂、防沉剂、增透剂、催化剂、固化剂、alcat-cs02、alcat-cs03、aucat-1001e、防水环保、化工助剂、抗静电剂、跑道环保、凝胶涂料、不同金属、运动场地
- 主营：树脂合、木质素、分析纯、化学试剂、涂覆金属、己二醇酯、油墨pu树脂、水性pu树脂、二乙二醇酯、二酸二甲酯、聚酯多元醇、树脂固化剂、水性聚氨酯、聚酰胺树脂、聚氨酯树脂、聚氨酯弹性体、水性喷墨打印、聚碳酸酯二醇、面料柔软整理、己二酸乙二醇、改性聚酰亚胺
- 主营：抗氧剂、光稳定剂、消泡剂、气相二氧化硅、紫外线吸收剂、碳黑、白炭黑、颜料、染料、树脂、表面活性剂、消光粉、增塑剂、分散剂、光引发剂、钛白粉、固化剂
- 主营：碳酸钙、高岭土、滑石粉、负离子、金刚砂、贝壳粉
- 主营：偶联剂、有机硅