Buy good quality Fumed Silica 200 to 300 m2/g grade high Specific Surface Area at Wedge India. Fumed silica, also known as pyrogenic silica, is a very fine, fluffy white powder that’s a type of silicon dioxide (SiO₂). It is produced by the flame hydrolysis of silicon tetrachloride or from quartz sand vaporized in a 3000 °C electric arc. Fumed silica is known for its unique properties, such as its extremely low bulk density and high surface area.
 
Key Properties Fumed Silica
• High Surface Area: Fumed silica has a high surface area, typically in the range of 50-600 m²/g.
• Thixotropy: It exhibits thixotropic behavior, meaning it can become less viscous under shear stress and then return to a more viscous state when the stress is removed.
• Reinforcement: It is commonly used as a reinforcing agent in materials like silicone rubber and adhesives.
• Anti-Caking: Fumed silica is used to prevent caking in powdered or granulated materials by absorbing moisture and reducing flow resistance.
 
Applications of Fumed Silica
• Thickening Agent: Used in paints, coatings, adhesives, sealants, and cosmetics as a thickening and anti-settling agent.
• Reinforcement in Composites: Enhances the strength and durability of materials like silicone rubber and plastics.
• Pharmaceuticals: Used in tablet formulation as a glidant, improving powder flow properties.
• Defoamers: Reduces foaming in industrial processes.
 
Fumed silica is also used in thermal insulation applications, particularly in high-performance insulation materials. Its extremely fine particles and high surface area contribute to its effectiveness as an insulating material. Here’s how fumed silica functions in thermal insulation:
 
How Fumed Silica Works in Thermal Insulation:
1. Low Thermal Conductivity:
• Fumed silica has a very low thermal conductivity, making it an excellent material for insulating applications. The fine particles trap air in the structure, which reduces heat transfer.
2. Porous Structure:
• The porous structure of fumed silica helps to minimize the solid conduction and convection of heat. The trapped air within its structure further enhances its insulating properties.
3. High Surface Area:
• The high surface area of fumed silica means that it can create a dense network of particles, which adds to its ability to block the transfer of heat.
 
Fumed silica is valued for its versatility and its ability to improve the performance of many products across various industries.