Is fumed silica same as silica fume?

When it comes to fumed silica and silica fume, it is important to note that they are not the same thing. In fact, they are quite different in terms of their properties and uses.

**What is fumed silica?**.

Fumed silica is a fine powder that is made by burning silicon tetrachloride in a flame of hydrogen gas. This process creates a highly pure form of silicon dioxide that has a very small particle size, usually in the range of 7-40 nanometers. Fumed silica is known for its high surface area and excellent thickening and reinforcing properties.

**What is silica fume?**.

Silica fume, on the other hand, is a byproduct of the production of silicon metal and ferrosilicon alloys. It is produced when silica (or quartz) is reduced to silicon using a submerged arc furnace. Silica fume consists of very fine particles, typically with a particle size of less than 1 micron. It is known for its pozzolanic properties and ability to improve the strength and durability of concrete.

**Differences between fumed silica and silica fume**.

1. **Production process**: Fumed silica is produced by burning silicon tetrachloride in a flame, while silica fume is a byproduct of the production of silicon metal and ferrosilicon alloys.

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2. **Particle size**: Fumed silica has a particle size in the range of 7-40 nanometers, whereas silica fume has a particle size of less than 1 micron.

3. **Properties**: Fumed silica is known for its high surface area and thickening properties, while silica fume is valued for its pozzolanic properties and ability to enhance the strength and durability of concrete.

In conclusion, fumed silica and silica fume are two distinct materials with different properties and applications. While fumed silica is commonly used as a thickening and reinforcing agent in various industries, silica fume is primarily used in concrete applications to improve its performance and longevity. Understanding the differences between these two materials is crucial for selecting the right product for a specific application.

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