# Polymaleic Acid

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**Safety rating:** UNKNOWN
**CAS number:** 26099-09-2
**Category:** other
**FDA GRAS:** no
**Adverse events (FDA AERS):** 0
**FDA recalls:** 0
**Last updated:** 2026-04-04

## Summary

Polymaleic acid (CAS 26099-09-2) is a synthetic polymer derived from maleic acid used as a processing aid in food manufacturing. It functions to improve texture, stability, and production efficiency in various food applications.

## 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 Polymaleic Acid?

Polymaleic acid is a synthetic polymer created through the polymerization of maleic acid, an organic compound derived from petroleum sources or biological feedstocks. The polymer consists of repeating maleic acid units linked together in a chain structure. With the CAS number 26099-09-2, polymaleic acid exists as a colorless to pale yellow liquid or solid depending on its molecular weight and formulation. It is classified as a processing aid rather than a direct food additive, meaning it functions during food production but may not remain in the final product in significant quantities.

## Common Uses

Polymaleic acid serves as a processing aid in food manufacturing, where it is employed to:

- Improve the texture and mouthfeel of food products
- Enhance stability in emulsions and suspensions
- Facilitate production efficiency in beverage systems
- Provide chelation properties to bind metal ions that could affect product quality
- Support the stabilization of proteins and other food components

The additive is particularly useful in applications requiring precise control over viscosity and particle suspension, though specific food categories utilizing this ingredient vary by region and manufacturer proprietary formulations.

## Safety Assessment

Polymaleic acid has not been formally designated by the FDA as Generally Recognized as Safe (GRAS). However, the FDA database contains zero adverse event reports and zero product recalls associated with this additive, suggesting a favorable safety profile in current use. The lack of reported adverse events indicates that any food products containing or processed with this additive have not generated consumer safety complaints or regulatory concerns significant enough to warrant investigation.

As a processing aid, polymaleic acid may be present only in trace amounts in finished food products, as many processing aids are either removed or significantly reduced during manufacturing. This distinction is important because exposure levels are typically much lower than for direct food additives.

Toxicological data on polymaleic acid remains limited in publicly available scientific literature. The polymer's safety profile would reasonably depend on factors including molecular weight, degree of polymerization, residual monomers, and levels of human dietary exposure. Maleic acid itself has an established history of industrial use, and its polymeric forms generally exhibit reduced reactivity compared to the monomeric form.

## Regulatory Status

Polymaleic acid does not hold FDA GRAS status, which means it has not been through the formal GRAS notification process or been independently recognized by qualified experts as safe for its intended use. Despite this classification, the additive appears in use within the food industry in certain applications.

Regulatory status varies internationally. Different countries maintain separate approval processes and ingredient lists. The European Food Safety Authority (EFSA) and other regional regulatory bodies may have different assessments or approvals for this substance. Manufacturers using this ingredient should verify compliance with local regulations in their target markets.

The absence of GRAS status does not automatically indicate concern; rather, it reflects that this particular compound has not pursued or completed FDA's GRAS notification pathway. Some processing aids operate under different regulatory frameworks or grandfathered approvals.

## Key Studies

Publicly available peer-reviewed research specifically examining polymaleic acid safety in food applications is limited. Most available information comes from:

- FDA regulatory databases and adverse event tracking systems
- Manufacturer technical documentation and safety data sheets
- General toxicology literature on maleic acid and its derivatives
- Industrial chemistry and food science publications

The absence of epidemiological studies or formal safety assessments in published literature reflects both the limited human dietary exposure and the processing aid classification, which typically involves lower regulatory scrutiny than direct food additives. Any new safety data or studies would typically be submitted to regulatory agencies through formal pathways.

## 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. "Polymaleic Acid — Safety, regulation, and evidence." https://additivefacts.com/additives/polymaleic-acid. Accessed 2026-05-20.