Heavy Calcium Carbonate for Foaming
Overview
Heavy calcium carbonate for foaming is a finely ground mineral filler derived from natural limestone or marble. It is engineered to enhance foam formation in polymers by acting as a nucleating agent, improving cell structure uniformity while reducing raw material costs. Unlike precipitated calcium carbonate (PCC), foaming-grade heavy CaCO3 offers superior thermal stability and lower reactivity, making it ideal for high-temperature processing in PVC foam boards, synthetic leather, and EVA foam products. Its cost-effectiveness accounts for 20-40% of global mineral filler usage in polymer applications.
Physical and Chemical Properties
This material exhibits a rhombohedral crystal structure with a Mohs hardness of 3, ensuring minimal abrasion to processing equipment. Its bulk density typically ranges from 0.7-1.1 g/cm³, optimized for uniform dispersion in polymer matrices. Key quality indicators include controlled particle size distribution (D97 < 20µm) and low heavy metal content (<10ppm). The material's brightness (ISO 2470) exceeds 94%, crucial for applications requiring color consistency. Surface treatments like stearic acid coating are sometimes applied to improve compatibility with hydrophobic polymers.
Main Applications
In PVC foaming applications, heavy calcium carbonate reduces density by 15-30% while maintaining mechanical strength, widely used in interior decoration boards and automotive trim. For rubber products like EPDM seals, it enhances compression set resistance and reduces formulation costs by 10-25%. The construction sector utilizes it in lightweight concrete blocks and tile adhesives, where its particle shape improves workability. Emerging applications include biodegradable PLA foams, where it accelerates decomposition while maintaining cushioning properties.
Safety and Storage
Although non-hazardous per GHS classification, prolonged inhalation of dust may cause respiratory irritation. NIOSH recommends P1/P2 dust masks during bulk handling. Static electricity accumulation during pneumatic transfer requires grounding measures. Storage should maintain relative humidity below 60% to prevent caking. Bulk bags should be stacked no more than 3 layers high. Shelf life is typically 12 months when properly stored, with quality checks recommended after 6 months for critical applications.
B2B Procurement Guide
Industrial buyers should specify: 1) Particle size distribution (D50 and D97 values), 2) Surface treatment requirements (untreated or coated), 3) Whiteness tolerance (±2 points), and 4) Maximum moisture content. Sample testing with actual production formulations is strongly advised. Leading producing regions include Guangxi, China (high brightness marble sources) and the Alpine region in Europe. MOQ for container loads is typically 20-25 metric tons, with spot prices fluctuating with limestone quarrying costs. Quality certifications like ISO 9001 and REACH compliance documents should be requested.
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