Heavy Calcium Carbonate is a naturally derived, mechanically processed mineral obtained by grinding and classifying high-purity limestone or marble. It is characterized by its irregular particle shape, broad particle size distribution, and high bulk density. As an economical and versatile filler, it is widely used to reduce costs and modify properties in numerous industries.

• Source: Natural minerals (limestone, marble)
• Production Method: Physical processes - crushing, grinding, classification
• Particle Morphology: Irregular, angular shapes
• Surface Chemistry: Polar, hydrophilic (can be surface-modified)
• Key Differentiator vs. Precipitated Calcium Carbonate (PCC): Lower production cost, higher bulk density, broader particle size distribution, naturally derived irregular particle shape.

• PVC Products (Pipes, Profiles, Wires & Cables): Improves stiffness, heat resistance, and dimensional stability while significantly reducing material costs. High-loading formulations are common.
• Polyolefins (PP, PE): Enhances rigidity and improves surface finish in injection-molded parts.
• Thermosets (SMC/BMC): Used as a low-profile additive and filler, providing smooth surface finish and dimensional stability in automotive and construction parts.

• Architectural Coatings: Improves durability, scrub resistance, and sheen control. Contributes to dry film hiding power through spacing effects, allowing for partial replacement of TiO₂.
• Industrial Coatings: Enhances sandability, corrosion resistance (as a barrier pigment), and sag control.
• Primers & Putties: Provides body, reduces cost, and improves sanding properties.

• Paper Filling: Improves brightness, opacity, and printability in standard printing and writing paper.
• Paper Coating: Used in coating formulations for paperboard and printing paper to enhance smoothness, gloss, and ink receptivity.

• General Rubber Goods: Improves hardness, tensile strength, and processability in products like hoses, belts, and gaskets. Often used in combination with other fillers like carbon black.
• Footwear: Provides reinforcement and reduces cost in rubber soles.

• Construction Adhesives & Sealants: Imparts non-sag properties, reinforces, and acts as a cost-effective extender.
• Industrial Sealants: Improves cohesive strength and weather resistance.

• Dry-Mix Mortars: Improves workability, water retention, and mechanical strength in tile adhesives, grouts, and self-leveling compounds.
• Asphalt & Roofing: Used as a filler in asphalt mixtures and roofing felts to improve stability and weather resistance.

• Advanced Grinding Mills: Utilization of ball mills, vertical roller mills, and classifier mills equipped with high-efficiency classifiers (e.g., turbine classifiers) enables precise control over the top particle size (d97) and particle size distribution.
• Ultra-Fine Grinding: Production of GCC with particle sizes down to d97 = 2 µm or less, blurring the performance gap with some PCC grades for specific applications.

• Coupling Agent Treatment: Application of stearic acid, silanes, titanates, and aluminum zirconates improves compatibility with polymer matrices, enhancing dispersion, mechanical properties, and moisture resistance. This expands GCC's application in high-performance polymer composites.

• Low Energy Footprint: The mechanical production process generally consumes less energy compared to the chemical precipitation process used for PCC.
• Natural & Abundant: Utilizes abundant natural mineral resources.
• Recyclability: GCC-filled plastic and rubber products can often be recycled.
• Dust Control: Modern production facilities are equipped with efficient dust collection systems.

• Automated Process Control & Online Monitoring: Ensures consistent product quality in terms of particle size distribution, brightness, and chemical composition.
• Advanced Characterization: Laser particle size analyzers, BET surface area analyzers, and SEM are routinely used for quality assurance.

• CaCO₃ Content: Typically >98.5%
• Brightness (ISO): Can exceed 95% for high-purity grades
• Particle Size (d97): Ranges from ~2 µm (ultra-fine) to >50 µm (coarse)
• Specific Surface Area (BET): Generally lower than PCC for comparable particle size, typically 1 - 10 m²/g
• Oil Absorption: Lower than PCC, typically 15 - 30 g/100g

• Appearance: White powder.
• Bulk Density: High, typically 0.8 - 1.3 g/cm³ (hence "heavy").
• Specific Gravity: ~2.7
• pH (Slurry): ~8-9

• Provides comprehensive technical data sheets (TDS) detailing particle size distribution, chemical composition, and physical properties.
• Offers guidance on grade selection, optimal loading levels, and compounding parameters for specific applications.
• Provides surface-treated grades tailored for enhanced performance in polymer applications.