White Carbon Black Main Types and Differentiation

White carbon black is mainly divided into two major categories based on production process, with significant differences in performance, application, and cost:

Precipitated Silica:

Production Process: Uses quartz sand (or sodium silicate) and soda ash (or sulfuric acid, hydrochloric acid, carbon dioxide) as raw materials. It undergoes steps including high-temperature melting, dissolution, precipitation reaction, filtration, washing, drying, and crushing. Simply put, it involves precipitating silica dioxide out of a silicate solution under acidic conditions.

Characteristics:

• Larger Particle Size: Primary particles typically range from 10-40 nm (but tend to agglomerate into larger secondary particles).
• Medium Specific Surface Area: Generally around 100-200 m²/g 
• Medium Oil Absorption: Oil absorption capacity is not as strong as fumed silica.
• Relatively Lower Purity: May contain small amounts of impurities.
• Lower Structure: The chain-like structures formed by particle aggregation are less developed than in fumed silica.
• Lower Cost: It is the most widely used and highest production volume type of silica.

Fumed Silica:

Production Process: Uses silicon tetrachloride (or organosilanes, siloxanes) as raw materials. Silica micro-particles are generated by high-temperature hydrolysis in a hydrogen-oxygen flame, instantly condensing into nano-sized particles. The final product is obtained through processes of aggregation and deacidification.

Characteristics:

• Extremely Small Particle Size: Primary particles typically range from 7-40 nm, with good dispersibility.
• Very High Specific Surface Area: Typically between 100-400 m²/g (or even higher), which is one of the most critical indicators for distinguishing it from precipitated silica.
• Very High Oil Absorption: Exhibits very significant thickening and thixotropic effects.
• Very High Purity: SiO₂ content usually > 99.8%, with extremely few impurities.
• High Structure: Particles form a well-developed three-dimensional network structure, resulting in excellent reinforcing effects.

Silica Used For Rubber Industry (Primary Application):

Tires: Serves as a key reinforcing filler for green tires, particularly precipitated silica. It significantly reduces tire rolling resistance, saves fuel, improves wet grip (anti-skid properties), and is a core material for achieving high performance and environmental friendliness in tires by replacing carbon black.

Non-Tire Rubber Products: Used in shoe soles (wear resistance, anti-slip, lightweight), hoses, tapes, seals, vibration dampeners, etc., providing reinforcement, wear resistance, and improved processing performance. Both precipitated and fumed silica are used.

Ecopower precipitated silica in rubber(Powder,Granular,Micropearl)

Ecopower Highly Dispersible Silica (Granular, Micropearl)

Silica Used For Silicone Rubber:

Fumed silica is the primary reinforcing filler for silicone rubber (both High-Temperature Vulcanizing (HTV) and Room-Temperature Vulcanizing (RTV)).It imparts silicone rubber with excellent:Mechanical strength,High transparency (crucial for transparent rubber),Heat resistance,Electrical insulation properties.

Ecopower Silica in Silicone Rubber(SAI SERIES)

Silica Used For Toothpaste:

Precipitated silica is the most commonly used abrasive and thickener in toothpaste. It provides mild cleaning power while helping to stabilize the paste texture and prevent phase separation.

Ecopower Tooth Grade Silica

Silica Used For Coatings, Inks, and Adhesives:

Fumed silica is widely used as an anti-settling agent, thickener, and thixotrope. It effectively prevents pigment settling, improves application properties (anti-sagging), and enhances storage stability. 

Silica Used For Pesticides and Veterinary Drugs:

Used as a carrier or auxiliary agent to help uniformly disperse active ingredients, prevent caking, and improve flowability (flow aid) and suspension.

Product Type ：Flecosil-300 high oil absorption silica

Silica Used For Food Industry:

Used as an anticaking agent (e.g., in powdered foods, seasonings, milk powder to prevent caking), a flow aid, and a clarifying agent (e.g., for beer, juice filtration). White carbon black that meets food-grade standards must be used (primarily precipitated silica).

Silica Used For Plastic

Customization services available upon request—contact Ecopower team for details.