Fumed silica is an amorphous silica product produced by high temperature hydrolysis of organic halogenated silanes in a hydroxide flame, with a primary particle size between 7 and 40 nanometers and a specific surface area generally greater than 100m2/g. The product is extremely pure, with a silica content of not less than 99.8%. Due to its good stability, physiological inertness and thickening properties, it can be widely used in the field of daily necessities.
Fumed silica is a very important and effective additive in body care products, where a small amount can have a significant effect. It can also play a thixotropic and thickening function in toothpaste, sunscreen, mask and other gel or paste products, the dosage is generally 1-3%, some as high as 4-8%. In such as pearlescent nail polish or spray-type care products, fumed silica mainly plays a suspending role, making the various components of which are evenly dispersed in the system to prevent settling and increase the storage stability of the system. In hair care products, fumed silica also has a wide range of applications. For example, anti-dandruff shampoo contains some active ingredients such as selenium sulfide, salicylic acid, sulfur, zinc compounds, etc., most of these ingredients need to form a good dispersion and suspension in the system, adding fumed silica can meet the requirements. In water-in-oil products, there is generally a greasy feeling, after adding fumed silica, it can reduce the greasy, sticky feeling. In oil-in-water products, fumed silica can improve the temperature and pH stability of the product. In sunscreen oil, adding surface-treated fumed silica can not only improve the texture, but also improve its water resistance, and the general dosage is 0.5-3%. Surface-treated fumed silica can improve the moisture resistance of creams and gels, which is very favorable to lipsticks, eyebrow oils, cosmetics, and whitening creams and sunscreens.
Since the specific surface area of fumed silica is relatively high and the surface polarity is relatively strong, thus in the powder system, the high adsorption of fumed silica can be utilized to prevent the agglomeration of the system. In addition, fumed silica, due to its relatively small particle size, is dispersed in the powder system and then covered on the surface of the system particles, which, in the process of use, can play a role of internal lubrication and increase the fluidity of the system. For example, in the toning powder, add fumed silica, it can adsorb part of the water, so as to obtain the effect of dryness, and can effectively prevent caking, improve mobility, its dosage is generally 0.5 ~ 6%. In addition using the high specific surface area, small particle size and high adsorption of fumed silica, it can be used to adsorb flavor for powdered cosmetics, and at the same time it can control the release rate of the flavor. In addition, in powder cosmetics, such as facial care products, antiperspirant, etc., fumed silica can adsorb excessive oil and water, and obtain good use effect.
At present, foreign fumed silica producers have a wide range of products, all of which are specialized in different fields, and the products are very functional. With the improvement of the production level of fumed silica and the increase of people's understanding of fumed silica, the application of fumed silica in daily necessities will be more and more extensive.

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