The function of white carbon black
White carbon black is a porous substance that is soluble in caustic soda and hydrofluoric acid, but insoluble in water, solvents, and acids (excluding hydrofluoric acid). It is heat-resistant, non flammable, odorless, and has good electrical insulation properties. The porosity and high dispersibility of white carbon black make it highly capable of adsorbing a large amount of substances. Meanwhile, its lightweight and good chemical stability also make it widely used in multiple fields. In addition, white carbon black also has certain functions such as thickening, extinction, and reinforcement, which can improve the strength, hardness, and wear resistance of materials.

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Classification of White Carbon Black
White carbon black is the general term of white powder X-ray amorphous silicic acid and silicate products, mainly referring to precipitated silica, fumed silica, ultra-fine silica gel and aerogel, as well as powder synthetic aluminum silicate and calcium silicate. According to the production method, white carbon black is generally divided into precipitation method white carbon black and gas-phase method white carbon black. Under normal conditions, gas-phase white carbon black is a white amorphous flocculent semi transparent solid gel like nanoparticle (particle size less than 100nm), all of which are nano silica. The product purity can reach 99%, and the particle size can reach 10-20nm, but the preparation process is complex and expensive. Precipitation white carbon black can be divided into traditional precipitation white carbon black and special precipitation white carbon black. The former refers to silicon dioxide produced with sulfuric acid, hydrochloric acid, CO2 and water glass as basic raw materials, and the latter refers to silicon dioxide produced with special methods such as high gravity technology, sol gel method, chemical crystal method, secondary crystallization method or reverse micellar micro lotion method.


Recently, the export volume of white carbon black in China has continued to grow, becoming a net exporter. Taking Sanming City in Fujian Province as an example, the region is known as the "hometown of inorganic silicon in China". The total production capacity of white carbon black accounts for about 30% of the country's total, and its export value ranks third in the country. In order to promote the export of white carbon black products, Sanming Customs has innovatively applied the "One Lock Pass" direct business model of Fuzhou Xiamen transit, and turned Sanming Haixi International Land Port into an "outbound port" to help local enterprises achieve fast customs clearance at their doorstep. According to statistics, in the first half of 2024, the number of silica products declared for export through land ports under the supervision of Sanming Customs increased significantly, and the products were exported to 13 foreign markets. This news demonstrates the vigorous development of China's white carbon black industry and the enormous export potential.