Why Food-Grade Silica Is Selected for Edible Salt in Humid South America? Grade Selection, Dosage & Compliance

Salt caking has long been a common headache for salt manufacturers and distributors across Brazil, Argentina, Peru and other South American countries. High temperature and humidity, long overland & ocean transport, and multi-layer warehousing impose strict requirements on salt anticaking performance. Among various anticaking agents, food-grade silica has gradually become the mainstream choice for South American salt industry thanks to its high efficiency, safety and compliance.

Traditional anticaking agents such as tricalcium phosphate and magnesium carbonate lose effectiveness rapidly when ambient humidity exceeds 65%. The porous structure of silica continuously absorbs free moisture, keeping salt free-flowing for 3–6 months even during South America's rainy season and protecting finished appearance.

Typical dosage in salt is 0.1%–0.3%, much lower than other anticaking agents. It disperses evenly with salt particles without local agglomeration and will not affect salt whiteness or taste. For large salt plants, small addition can solve caking issues for the whole batch.

MERCOSUR approves silica as an anticaking agent for edible salt with a limit of 1.5%. It also complies with Codex food standards and requires no extra approval for circulation across South American countries.

Prefer grades with high oil absorption to boost moisture adsorption for humid storage and ocean transport

Match salt particle size to avoid segregation and guarantee uniform mixing

Heavy metal and arsenic levels below regulatory limits, low iron, no black specks to preserve salt whiteness

Recommended dosage: 0.1%–0.2% for refined salt; 0.2%–0.3% for higher-moisture sea salt and seasoned salt. Final dosage should be confirmed by lab tests according to local humidity, packaging and storage cycle.

Process recommendation: Dry mixing after salt is fully dried and cooled. Avoid opening packages and feeding under humid conditions to prevent premature moisture absorption of silica. Store goods in dry warehouses and reseal damaged packages promptly.

Prepare documents in advance for salt-use silica exported to Brazil and South America:

Food-grade silica is more than a simple additive. It is a functional raw material helping South American salt manufacturers guarantee finished quality, reduce logistics loss and maintain end-market reputation. Proper grade selection, precise dosage control and compliant procurement enable consistent salt quality through the hot and humid South American supply chain.