Silica can be roughly divided into precipitated silica and Fumed silica according to production methods. Under normal conditions, Fumed Silica is a white amorphous flocculent semi transparent solid colloidal nanoparticle (particle size less than 100nm), non-toxic, and has a huge specific surface area. Gas phase white carbon black is entirely made of nano silica, with a product purity of up to 99% and a particle size of 10-20nm. However, the preparation process is complex and expensive; Precipitation silica can be divided into traditional precipitation silica and special precipitation silica. 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. Precipitated silica is mainly used as a reinforcing agent for natural rubber and synthetic rubber, as well as a friction agent for toothpaste. Fumed silica is mainly used as reinforcing agent, coating and unsaturated resin thickener of silicone rubber, and ultra-fine silica gel and aerogel are mainly used as coating matting agent, thickener, plastic film opening agent, etc.


As an environmentally friendly and high-performance additive, white carbon black is mainly used in rubber products (including high-temperature vulcanized silicone rubber), textiles, papermaking, and pesticides