Overview
Clam shell extract is a sustainable material derived from the calcified shells of marine bivalves, primarily composed of calcium carbonate (90-95%) with trace organic components. The extraction process typically involves cleaning, drying, and micronizing shells into powder form, sometimes with additional purification steps. As a byproduct of the seafood industry, clam shell extract represents an eco-friendly alternative to mined calcium carbonate, aligning with circular economy principles. Its unique microstructure and natural origin make it valuable across multiple industries, from agriculture to personal care.
Physical and Chemical Properties
The extract's primary component, calcium carbonate, exists in the stable calcite form with a rhombohedral crystal structure. The material exhibits high porosity and surface area (10-50 m²/g) due to retained organic matrix channels, enhancing its reactivity compared to geological calcium carbonate. Notable characteristics include alkaline pH (8-9 in suspension), low heavy metal content when sourced from clean waters, and trace amounts of beneficial minerals like magnesium, strontium, and phosphorus. The organic fraction (1-5%) contains chitin derivatives and proteins that may contribute to biological activity.
Main Applications
In agriculture, clam shell powder serves as a pH balancer for acidic soils and slow-release calcium fertilizer, particularly beneficial for crops like tomatoes and apples. The cosmetic industry utilizes its mild abrasive properties in exfoliating scrubs and toothpaste formulations. The pharmaceutical sector employs it as an excipient in tablets and a calcium supplement source. Emerging applications include water filtration media (for phosphate removal), biodegradable packaging filler, and bioactive material for bone graft substitutes due to its osteoconductive properties.
Safety and Storage
While generally non-toxic, clam shell extract requires standard precautions for fine powders - use dust masks during handling and ensure adequate ventilation. The material is non-flammable but may decompose at high temperatures, releasing carbon dioxide. Proper storage involves keeping the product in moisture-resistant packaging below 30°C to prevent caking. Shelf life typically exceeds 2 years when stored correctly. Regulatory status varies by application - food-grade versions require certification, while industrial grades need compliance with relevant safety data sheet (SDS) requirements.
B2B Procurement Guide
Commercial buyers should specify particle size distribution (typically 50-500 mesh), calcium carbonate content (≥90% for most applications), and microbial limits (<1000 CFU/g for sensitive uses). Request certificates of analysis for heavy metals (lead <5ppm, arsenic <3ppm) and radionuclide testing for certain markets. Consider suppliers with HACCP-certified processing facilities for food/pharma applications. Bulk shipments (25kg bags or supersacks) offer 15-30% cost savings over small quantities. For consistent quality, establish long-term contracts with suppliers who can trace material to specific harvesting regions.
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