Calcium Carbonate Powder for Filling
Overview
Calcium carbonate powder for filling is a processed mineral product derived from natural limestone or marble. It serves as a cost-effective filler and performance enhancer in numerous industrial applications. The material is valued for its ability to improve mechanical properties while reducing production costs in polymer and coating formulations. Industrial-grade calcium carbonate fillers are classified by particle size distribution, ranging from coarse (5-10 μm) to ultrafine (0.7-2 μm). The production process typically involves crushing, grinding, and classification to achieve desired particle characteristics. Modern processing techniques allow for surface modification to enhance compatibility with various polymer matrices.
Physical and Chemical Properties
Filler-grade calcium carbonate exhibits a trigonal crystal structure with Mohs hardness of 3, making it relatively soft among industrial minerals. Its refractive index (1.59) provides good optical properties in plastic applications. The material is chemically stable under normal conditions but decomposes at high temperatures (above 825°C) to form calcium oxide and carbon dioxide. Key quality parameters include particle size distribution (typically D50 1-5 μm for most applications), specific surface area (1-10 m²/g), and oil absorption value (20-35 g/100g). Surface-treated grades show improved dispersion in organic matrices and reduced moisture absorption compared to untreated powder.
Main Applications
In plastics manufacturing, calcium carbonate filler improves stiffness, impact resistance, and dimensional stability while reducing material costs. PVC products commonly incorporate 5-40% loading. The rubber industry utilizes it as a semi-reinforcing filler in tires, footwear, and technical rubber goods, where it enhances processability and mechanical properties. The paper industry employs precipitated calcium carbonate (PCC) as a coating pigment and filler to improve brightness and opacity. In construction, it serves as a raw material for sealants, adhesives, and cement products. Coatings and paints benefit from its light-scattering properties and rheological modification capabilities.
Safety and Storage
While calcium carbonate is generally recognized as safe (GRAS), industrial handling requires dust control measures. Prolonged inhalation of airborne particles may cause respiratory irritation. Appropriate personal protective equipment (PPE) including NIOSH-approved dust masks should be used during bulk handling operations. Storage facilities should maintain relative humidity below 65% to prevent caking. Bulk bags should be stacked no more than 3 layers high to preserve powder flow characteristics. The material is non-flammable and chemically stable under normal storage conditions, requiring no special hazardous material handling procedures.
B2B Procurement Guide
Industrial buyers should specify particle size distribution (PSD), surface treatment (if any), and whiteness index (typically 90-96%) when sourcing calcium carbonate fillers. For polymer applications, verify compatibility testing results with specific resin systems. Request certificates of analysis (CoA) for each batch, including moisture content (should be <0.5% for most applications). Consider transportation costs carefully as calcium carbonate has relatively low bulk density (0.7-1.1 g/cm³). Regional suppliers often offer competitive pricing due to reduced logistics expenses. For large-volume contracts (1000+ metric tons annually), negotiate pricing based on quarterly or annual purchase commitments.
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