White carbon black, also known as hydrated silica (SiO2, Precipitated Silica, White Carbon, Silicon Dioxide, Silica Powder, Amorphous Precipitated Silica) with the chemical formula SiO2•nH2O, is an inorganic silicon compound that is white, non-toxic, amorphous, and finely powdered. It possesses excellent properties such as porosity, high dispersibility, lightweight, good chemical stability, high temperature resistance, non-combustibility, and good electrical insulation. It has been widely used in various fields such as plastics, rubber, papermaking, coatings, dyes, and inks.

Application in Tires

White carbon black is used as a reinforcing agent, with the largest usage in the rubber industry, accounting for 70% of the total usage. White carbon black significantly improves the physical properties of rubber compounds, reduces hysteresis, reduces rolling resistance of tires, while maintaining its wet skid resistance. In the rubber industry, carbon black is an effective reinforcing filler, but it cannot be used to produce colored products. Ultrafine white carbon black, as a reinforcing filler, can be used in the production of green tires, replacing carbon black in the sidewall. It significantly increases the tear strength and crack growth resistance of the sidewall without affecting the curing time. Ozone resistance depends on the amount of antioxidant and white carbon black used. Adding white carbon black to the tread rubber of tires can improve the cut and tear resistance of the tread, reducing chunking and chipping. Compared to rubber compounds filled with ordinary carbon black, the rolling resistance can be reduced by 30% when white carbon black is used as a filler.

Application in Defoamers

Gas-phase white carbon black generally has two types of products: hydrophilic and hydrophobic. The hydrophobic products are obtained by treating the hydrophilic products through surface chemical modification. Nowadays, defoamer manufacturers commonly use hydrophobic gas-phase white carbon black, which utilizes the hydrophobic groups on its surface to attract the hydrophobic ends of surfactants in the foaming system. This transforms the hydrophobic solid particles into hydrophilic ones, thereby reducing the concentration of surfactants in the foam, promoting foam rupture, and increasing defoaming speed.

Application in Plastics

White carbon black is also commonly used in new types of plastics. Adding a small amount of white carbon black during plastic compounding has a significant reinforcing effect, improving the hardness and mechanical properties of the material, thereby enhancing processing and product performance. Additionally, white carbon black, with its small particle size and high transparency, can make plastics more compact and increase their transparency.

Application in Toothpaste

Precipitated white carbon black is currently the main type of abrasive used in toothpaste. Precipitated white carbon black has a larger specific surface area, stronger adsorption capacity, and can adsorb more substances. Its uniform particles contribute to increased transparency. Due to its stable and non-toxic nature, it is a good raw material for toothpaste. The refractive index of white carbon black ranges from 1.45 to 1.50, which is very close to the refractive index of other ingredients in toothpaste. When mixed together, it acts as a clarifying agent. This characteristic is utilized to manufacture transparent toothpaste, which is a unique function not present in other abrasives.

Application in Rubber Footwear

White carbon black, with its high whiteness and fine particles, can be used to produce transparent vulcanized rubber with high transparency. It can also improve the comprehensive physical properties of rubber materials. Therefore, white carbon black is widely used as the main reinforcing filler in the production of high-end leather shoes and sports shoe soles, especially in transparent and semi-transparent sole compounds. It can improve the wear resistance, hardness, tensile strength, and tear strength of the soles.

hydrated silica SiO2, Precipitated Silica, White Carbon, Silicon Dioxide, Silica Powder, Amorphous Precipitated Silica