# Sodium Aluminate

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**Safety rating:** UNKNOWN
**CAS number:** 1302-42-7
**Category:** other
**FDA GRAS:** no
**Adverse events (FDA AERS):** 0
**FDA recalls:** 0
**Last updated:** 2026-04-04

## Summary

Sodium aluminate (CAS 1302-42-7) is an inorganic compound containing sodium and aluminum. Its specific function in food applications remains unclear, and it is not approved as a food additive by the FDA.

## Regulatory status

| Country | Status |
| --- | --- |
| United States | approved |
| European Union | not_evaluated |
| United Kingdom | approved |
| Canada | approved |
| Australia | approved |
| Japan | approved |
| South Korea | approved |
| Brazil | approved |
| China | approved |
| India | approved |

## Detailed analysis

## What is Sodium Aluminate?

Sodium aluminate is an inorganic chemical compound with the chemical formula NaAlO2 or Na[Al(OH)4]. It is produced through the reaction of aluminum oxide (alumina) with sodium hydroxide. The compound exists as a white to grayish powder or as an aqueous solution and is highly soluble in water. Sodium aluminate is widely used in industrial applications including water treatment, paper production, and cement manufacturing.

## Common Uses

In industrial settings, sodium aluminate serves as a coagulating agent in water purification processes and as a component in various manufacturing processes. However, its specific applications in food manufacturing or as a food additive are not well-documented in available food safety literature. The function of this substance in food products, if any, remains unknown. It does not appear in standard food additive lists or databases as an approved ingredient in major food regulatory jurisdictions.

## Safety Assessment

Aluminum-containing compounds have been subject to ongoing scientific scrutiny due to concerns about aluminum accumulation in the human body. The FDA has not established sodium aluminate as a Generally Recognized As Safe (GRAS) substance for food use. According to FDA records, there have been zero adverse events and zero recalls associated with sodium aluminate in food products, though this may reflect its limited or absent use in food rather than demonstrated safety.

The European Food Safety Authority (EFSA) and other regulatory bodies have not approved sodium aluminate as a food additive. Aluminum itself is ubiquitous in food and the environment, occurring naturally in many foods and drinking water. However, regulatory agencies maintain cautious positions regarding additional aluminum from food additives, particularly given potential long-term accumulation concerns.

## Regulatory Status

Sodium aluminate is not listed as an approved food additive by the U.S. FDA. It does not appear on the FDA's Generally Recognized As Safe (GRAS) list for food applications. The substance is not authorized for food use in the European Union under current food additive regulations. In other jurisdictions, sodium aluminate similarly lacks approval as a food ingredient.

The compound is approved for use in water treatment and industrial applications in many countries, where its use is regulated under different safety frameworks than food additives. This distinction is important: approval for one application does not transfer to food use, which requires separate demonstration of safety and necessity.

## Key Studies

Limited peer-reviewed research specifically addresses sodium aluminate in food applications. Most toxicological data available relates to sodium aluminate's industrial uses and occupational exposure. General aluminum compound toxicology suggests that excessive aluminum exposure may pose concerns for vulnerable populations, though safe exposure thresholds remain debated in the scientific community.

The lack of clinical adverse events reported to the FDA likely indicates either minimal food use or complete absence from the food supply in regulated markets. Without documented food applications, there are limited human consumption studies specific to this compound as a food additive.

When evaluating sodium aluminate for potential food use, regulatory agencies would typically require absorption, distribution, metabolism, and excretion (ADME) studies, as well as acute and chronic toxicity assessments before approval consideration.

## Sources

- FDA Substances Added to Food (CFSAN)
- OpenFDA Adverse Event Reporting System (AERS)
- OpenFDA Food Recalls
- EFSA OpenFoodTox
- EU Food Additive Portal

## Citation

Additive Facts. "Sodium Aluminate — Safety, regulation, and evidence." https://additivefacts.com/additives/sodium-aluminate. Accessed 2026-05-20.