Fumed silica is an amorphous silica product obtained by hydrolyzing organohalosilane at high temperature in oxyhydrogen flame. Its primary particle size is between 7 ~ 40 nm, the specific surface area is generally greater than 100m2/g, the product purity is extremely high, and the silica content is not less than 99.8%. Fumed white carbon black has been produced industrially since the 1940s, and no cases of silicosis caused by inhaling fumed white carbon black have been found in industrial production in the past decades. The International Association for Research on Cancer (IARC) has stated that there is not enough evidence to prove that synthetic amorphous silica is carcinogenic to humans or laboratory animals, on the contrary, the IARC has listed crystalline silica as carcinogenic, and the European Community directive document (67/548/EEC) also states that amorphous silica is not a dangerous substance. Because of its good stability, physiological inertia, thickening and so on, it can be widely used in the field of daily necessities.

Fumed silica is a very important and effective additive in body care products, and adding a small amount can have a significant effect. Due to the presence of many hydroxyl groups on the surface of fumed carbon black, the interaction between particles is relatively strong. In the liquid system, the highly dispersed fumed carbon black easily interacts with each other in the system to form a three-dimensional network, which increases the viscosity of the system and effectively prevents the flow of the system at rest. However, when appropriate shear force is applied, the three-dimensional network is destroyed. So that the system has a liquid flow shape, when the shear force is eliminated, the network can be re-formed, so that the system can form a "gel" again. Therefore, it can be thixotropic and thickening in gel or paste products such as toothpaste, sunscreen, facial mask, and the amount is generally 1 ~ 3%, and some are as high as 4 ~ 8%. In products such as pearl-colored nail polish or spray-type care products, the vapor-phase white carbon black mainly plays a suspension role, making the various components evenly dispersed in the system, preventing settlement and increasing the storage stability of the system. Fumed white carbon black is also widely used in hair washing products. For example, 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, and after adding fumed white carbon black, the feeling of greasy and sticky can be reduced. In oil-in-water products, fumed silica can improve the temperature and pH stability of the product. In the sunscreen oil, adding the surface treatment of vapor phase white carbon black, not only can improve the texture, but also improve its water resistance, the general dosage is 0.5 ~ 3%. The surface treatment of fumed white carbon black can improve the moisture resistance of creams and gels, which is very good for lipstick, eyebrow oils, cosmetics, as well as whitening creams and sunscreens.


Since the specific surface area of fumed white carbon black is relatively high, and the surface polarity is relatively strong, so in the powder system, the high adsorbability of fumed white carbon black can be used to prevent the caking of the system. In addition, the fumed white carbon black is dispersed in the powder system because of its small particle size, and covered on the surface of the system particles, which can play the role of internal lubrication during use. Increase liquidity in the system. For example, in the toner powder, after adding vapor phase white carbon black, it can absorb part of the water, so as to obtain a dry effect, and can effectively prevent caking, improve fluidity, the amount is generally 0.5 ~ 6%. In addition, the high specific surface area, small particle size and high adsorption of vapor-phase white carbon black can be used to adsorb the essence for powder cosmetics, and it can also control the release speed of the essence. In addition, in powdered cosmetics, such as facial care products, antiperspirants, etc., fumed white carbon black can absorb too much oil and water, and obtain good results.


At present, there are many kinds of products of foreign fumed white carbon black production enterprises, which are developed into special products in different fields, and the product functionality is very strong. With the improvement of the production level of fumed white carbon black and the increase of people's understanding of fumed white carbon black, the application of fumed white carbon black in daily products will be more and more extensive.
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