Overview
High whiteness seashell powder is a natural calcium carbonate product processed from cleaned and sterilized marine shells. Its superior brightness (often ≥95%) and low impurity levels make it a preferred alternative to mined calcium carbonate in industries requiring aesthetic or functional purity. The material is sustainably sourced, often as a byproduct of fisheries, and is valued for its eco-friendly profile. It is chemically identical to limestone-derived calcium carbonate but typically offers better consistency in color and lower contaminant levels due to controlled sourcing.
Physical and Chemical Properties
The powder exhibits a hexagonal crystal structure with a refractive index of 1.59, contributing to its opacity and brightness in applications like paper coating. Its particle size typically ranges from 1-20μm, with finer grades used in cosmetics and coarser variants in plastics. Chemically inert under normal conditions, it decomposes at 825°C to calcium oxide. The material is insoluble in water but reacts with acids, making it useful as an antacid in pharmaceuticals. Its pH in suspension is 9-10, requiring neutralization in some formulations.
Main Applications
In paper manufacturing, the powder improves sheet smoothness, printability, and brightness as a coating pigment. The paint industry utilizes it as an extender pigment to enhance coverage while reducing titanium dioxide costs. The cosmetics sector values its gentle exfoliating properties in scrubs and its mattifying effect in powders. Food-grade versions serve as calcium fortifiers and acidity regulators. Emerging uses include biodegradable plastics filler and 3D printing material additive due to its thermal stability.
Safety and Storage
Being non-toxic and non-flammable, seashell powder requires standard industrial dust control measures. Prolonged inhalation of fine particles may cause respiratory irritation, warranting N95 masks in handling. Spills are non-hazardous but may create slippery surfaces. Storage should avoid humid conditions to prevent clumping. Bulk bags or moisture-resistant packaging are recommended. Shelf life exceeds 2 years if kept dry. Food/pharma grades require certification (e.g., FCC, USP) and separate storage from industrial grades.
B2B Procurement Guide
Key specifications to verify include whiteness (measured by ISO 2470 or TAPPI T452), particle size distribution (laser diffraction report), and residue on 325 mesh sieve. For sensitive applications, request heavy metal analysis (Pb, As, Hg) and microbial testing. Suppliers should provide traceability to shell sources, as estuary-origin shells may contain higher pollutants. Consider regional producers in Southeast Asia or Europe for consistent quality. MOQs typically start at 5 tons, with discounts at 20+ ton orders. Sample testing is strongly advised before large purchases.
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