Overview
Precipitated silica, commonly referred to as white carbon black, is a synthetic form of amorphous silica produced through the precipitation of sodium silicate with sulfuric acid or hydrochloric acid. It is widely recognized for its high surface area, porosity, and reinforcing properties. Unlike crystalline silica, precipitated silica is non-crystalline and poses fewer health risks. It is extensively used in industries such as rubber, plastics, and coatings due to its ability to improve mechanical properties and processing characteristics.
Physical and Chemical Properties
Precipitated silica exhibits a fine, white powder form with a high surface area ranging from 50 to 400 m²/g, depending on the production process. Its porous structure contributes to its excellent adsorption and thickening capabilities. The material is chemically inert, thermally stable, and resistant to most acids and alkalis. Its insolubility in water and organic solvents makes it suitable for applications requiring stability under various environmental conditions.
Main Applications
In the rubber industry, precipitated silica is a key reinforcing agent, improving tensile strength, abrasion resistance, and tear resistance in tires and other rubber products. It is also used as a thickening agent in adhesives, sealants, and coatings. The plastics industry utilizes precipitated silica to enhance mechanical properties and reduce shrinkage. Additionally, it serves as an anti-caking agent in food and pharmaceuticals, and as a mild abrasive in toothpaste and cosmetics.
Safety and Storage
While precipitated silica is generally considered safe, prolonged inhalation of dust can cause respiratory irritation. Proper ventilation and personal protective equipment (PPE) such as masks and gloves are recommended during handling. Storage should be in a dry, cool environment to prevent moisture absorption, which can affect the material's performance. Containers should be tightly sealed to avoid contamination.
B2B Procurement Guide
When procuring precipitated silica, B2B buyers should prioritize suppliers with consistent quality control and certifications such as ISO standards. Key specifications to consider include particle size distribution, surface area, and moisture content. Bulk purchasing may offer cost advantages, but buyers should ensure proper storage facilities to maintain product integrity. Sampling and testing are advisable to confirm suitability for specific industrial applications.
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