Overview
Sodium aluminosilicate is an inorganic compound primarily used as an anti-caking agent in powdered food products. Chemically inert and insoluble, it prevents clumping by absorbing moisture while maintaining product flowability. Its composition varies but typically contains sodium, aluminum, silicon, and oxygen in a porous structure. The substance is approved globally as food additive E554, with strict purity standards for food applications. In industrial contexts, its high surface area and stability make it valuable for catalytic and adsorption processes.
Physical and Chemical Properties
As an amorphous solid, sodium aluminosilicate lacks a defined melting point. Its porous structure provides a large surface area (100-300 m²/g), enabling effective moisture absorption. The material is thermally stable up to 500°C and maintains neutrality (pH 6.5-10.5 in aqueous suspension). Key characteristics include low bulk density (0.2-0.5 g/cm³) and exceptional chemical resistance. These properties derive from its three-dimensional aluminosilicate framework, where sodium ions balance the negative charges of aluminum and silicon oxides.
Main Applications
In food production, sodium aluminosilicate prevents caking in powdered products like table salt, milk powder, and baking mixes. It's particularly effective in hygroscopic substances, maintaining free-flowing properties even in humid conditions. The food industry typically uses concentrations of 0.5-2% by weight. Industrial applications include catalyst supports in petrochemical refining and desiccants for gas drying. Its molecular sieve variants selectively adsorb molecules based on size, useful in air separation and solvent purification systems.
Safety and Storage
Regulatory agencies including FDA and EFSA classify food-grade sodium aluminosilicate as GRAS when used within prescribed limits (usually ≤2%). No significant toxicity has been observed in animal studies, though excessive inhalation of dust may cause respiratory irritation. Storage requires protection from moisture absorption. Bulk quantities should be kept in original packaging or sealed containers with desiccants. Facilities should implement dust control measures during handling to minimize airborne particles.
B2B Procurement Guide
Buyers should specify food-grade (FCC) or technical-grade purity based on application. Key parameters include particle size distribution (typically 10-50 μm for food use), moisture content (<5%), and heavy metal limits. Suppliers should provide certificates of analysis and regulatory compliance documentation. For large-scale procurement, consider manufacturers with ISO 22000 or FSSC 22000 certification. Pricing varies by order volume, with container-load shipments offering 15-30% cost reductions compared to small batches. Lead times average 2-4 weeks for customized specifications.
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