Fumed silica is one of the most widely used thickening thixotropic agents.

Thickening, as the name implies, is the increase in the viscosity of the system; while thixotropy refers to the state where the system exhibits high viscosity under static or low shearing force; while under shaking or high shearing force, the system becomes thinner , The viscosity drops rapidly; and once the shaking or shearing force is stopped, the viscosity of the system recovers quickly, which is commonly referred to as thickening thixotropy.

There are many benefits of thickening and thixotropy. For example, after adding fumed silica to the paint, the viscosity of the paint is low and easy to paint when it is painted, but after painting, it becomes high in viscosity and can quickly maintain a smooth painting effect. Sagging, whitewashed walls are both bright and scratch-resistant. Among many high-end products, such as silica gel products, it is better to use the gas phase method for thickening.