Heavy Calcium Carbonate Powder for Paint Putty
Overview
Ground Calcium Carbonate (GCC) powder is a fundamental raw material in the coatings industry, particularly valued for paint and putty formulations. Produced by grinding naturally occurring limestone or marble, this inorganic filler improves coating performance while reducing production costs. The material's widespread adoption stems from its excellent compatibility with binders, ability to enhance opacity, and contribution to film reinforcement. In paint systems, GCC typically constitutes 10-30% of total formulation weight, serving as both an extender and functional additive.
Physical and Chemical Properties
Paint-grade GCC exhibits a Mohs hardness of 3, making it softer than many alternative fillers while maintaining sufficient structural integrity. Its refractive index (1.58) closely matches common paint resins, allowing for optimal light scattering without excessive gloss reduction. Critical quality parameters include controlled particle size distribution (typically D50 = 2-15μm) and strict limits on impurities like iron oxide (<0.1%). The material's low oil absorption (20-35g/100g) enables high loading capacity without compromising viscosity management in paint systems.
Main Applications
In architectural coatings, GCC improves putty workability and sanding properties while reducing shrinkage cracks. For water-based paints, it enhances scrub resistance and film durability. The powder's brightness (92-96% ISO) contributes to color development in tinted systems. Industrial applications include: interior/exterior emulsion paints, textured coatings, powder coatings, and wood finishes. Specialty grades with surface treatments (e.g., stearic acid coating) are available for enhanced dispersion in solvent-based systems.
Safety and Storage
As a non-hazardous material, GCC requires standard industrial hygiene practices. Dust control measures should be implemented during bulk handling to prevent respiratory exposure (TLV: 10mg/m³ total dust). Proper storage involves sealed containers or silos with desiccants to prevent moisture absorption, which can lead to clumping. Shelf life exceeds 2 years when stored correctly. Fire risks are minimal as the material is non-combustible and thermally stable below 800°C.
B2B Procurement Guide
Industrial buyers should specify: particle size distribution (laser diffraction results), brightness (ISO 2470), carbonate content (>98%), and moisture (<0.5%). Request technical datasheets with rheology test results in standard paint formulations. Quality verification should include laboratory testing of key parameters rather than reliance on certificate of analysis alone. Bulk shipments (25kg bags or 1-ton big bags) typically offer 10-15% cost savings versus small-quantity purchases. Establish long-term supply agreements with miners having consistent geological sources.
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