Overview
Precipitated Ground Calcium Carbonate (PGCC) is a synthetic form of calcium carbonate produced through a controlled chemical precipitation process. It is distinguished from ground calcium carbonate (GCC) by its finer particle size and higher purity. PGCC is widely used as a functional filler and coating pigment due to its excellent optical and physical properties. PGCC is manufactured by reacting limestone with carbon dioxide in a carefully controlled environment, resulting in a product with consistent particle size and morphology. This process allows for customization of properties such as particle size distribution, surface area, and brightness to meet specific industrial requirements.
Physical and Chemical Properties
PGCC typically exhibits a bright white color with high light reflectance, making it valuable for applications requiring optical properties. The particle size typically ranges from 0.5 to 3 microns, with specific surface areas between 5-25 m²/g. Its rhombic crystal structure contributes to its excellent dispersion characteristics. The material is chemically stable under normal conditions but decomposes at high temperatures (above 825°C) to form calcium oxide and carbon dioxide. PGCC is insoluble in water but readily reacts with acids, a property that makes it useful as an antacid in pharmaceutical applications. Its Mohs hardness of 3 makes it significantly less abrasive than many alternative fillers.
Main Applications
In the paper industry, PGCC serves as both a filler and coating pigment, improving paper brightness, opacity, and printability while reducing production costs. The plastics industry utilizes PGCC as a reinforcing filler that improves stiffness and impact resistance while reducing material costs in products ranging from PVC pipes to polypropylene packaging. The paint and coatings industry values PGCC for its ability to improve opacity, durability, and weather resistance. In construction, it's used in sealants, adhesives, and as a raw material for cement production. Emerging applications include use in food and pharmaceutical products as a calcium supplement and antacid, where high purity grades are essential.
Safety and Storage
While PGCC is generally regarded as non-toxic, proper handling procedures should be followed to minimize dust exposure. Inhalation of fine particles may cause respiratory irritation, necessitating the use of appropriate personal protective equipment including dust masks and eye protection in industrial settings. Storage requirements are relatively straightforward - PGCC should be kept in dry conditions to prevent caking. Bulk storage should be in silos or other containers that protect from moisture. Smaller quantities are typically packaged in moisture-resistant bags. The material is not flammable and poses minimal environmental risk, but spills should be cleaned promptly to prevent slip hazards.
B2B Procurement Guide
When procuring PGCC, buyers should carefully evaluate technical specifications including particle size distribution (PSD), brightness, and chemical purity. Particle size significantly affects performance in different applications - finer particles generally provide better optical properties but may increase viscosity in liquid systems. Quality consistency is crucial, so working with established manufacturers who implement strict quality control measures is recommended. Buyers should request certificates of analysis for each shipment. Transportation costs can be significant due to the bulk nature of the product, making regional sourcing advantageous where possible. For large-volume purchases, consider negotiating long-term contracts to stabilize pricing.
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