# Poly(maleic Anhydride), Sodium Salt

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**Safety rating:** SAFE
**CAS number:** 70247-90-4
**Category:** other
**FDA GRAS:** no
**Adverse events (FDA AERS):** 0
**FDA recalls:** 0
**Last updated:** 2026-04-04

## Summary

Poly(maleic Anhydride), Sodium Salt (CAS 70247-90-4) is a synthetic polymer used as a boiler water additive in food processing equipment. It functions to prevent scale buildup and corrosion in industrial steam generation systems used in food manufacturing.

## 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 Poly(maleic Anhydride), Sodium Salt?

Poly(maleic Anhydride), Sodium Salt is a synthetic polymer derived from maleic anhydride monomers. The compound consists of a backbone chain of maleic anhydride units converted to their sodium salt form. It is classified as an industrial chemical with specific applications in water treatment systems rather than as a direct food ingredient.

## Common Uses

This additive is used exclusively as a boiler water additive in food processing facilities. Its primary function is to condition water used in steam generation systems that support food manufacturing operations. The polymer works by sequestering minerals and preventing mineral scale formation (such as calcium and magnesium deposits) on boiler surfaces. By reducing scale buildup, it improves heat transfer efficiency and extends boiler lifespan. This application is indirect—the additive does not contact food directly but rather treats the water in industrial equipment.

## Safety Assessment

Poly(maleic Anhydride), Sodium Salt has not been designated as Generally Recognized as Safe (GRAS) by the FDA, which is consistent with its classification as an industrial processing aid rather than a food additive intended for direct food contact. The FDA has recorded zero adverse events and zero recalls associated with this substance, indicating no documented safety incidents in the regulatory database.

As a boiler water treatment chemical, exposure to the general population through food consumption is negligible since the compound is not designed to remain in finished food products. Boiler water additives function in closed industrial systems where they are separated from food by equipment barriers and processing steps.

The polymer's safety profile is supported by its use in industrial water treatment applications across multiple industries. Like other maleic anhydride copolymers used in food processing environments, it is subject to evaluation under food processing aid standards.

## Regulatory Status

Poly(maleic Anhydride), Sodium Salt is not on the FDA's GRAS list, reflecting its designation as a processing aid used in non-food-contact applications. However, its use in boiler water systems is permitted under FDA regulations governing indirect food additives and processing aids, provided it is used in accordance with good manufacturing practices and does not result in food adulteration.

The compound is recognized in industrial water treatment regulations and standards. Its sodium salt formulation is preferred in food applications because sodium salts are generally considered safe for indirect food processing environments.

Regulatory oversight focuses on ensuring boiler water additives do not contaminate food products and that equipment is properly maintained and cleaned to prevent additive carryover into finished foods.

## Key Studies

Limited published peer-reviewed literature specifically addresses Poly(maleic Anhydride), Sodium Salt in food processing contexts. Safety data primarily derive from industrial chemistry literature on maleic anhydride copolymers and their applications in water treatment.

Related research on maleic anhydride polymers demonstrates their effectiveness in mineral sequestration and scale prevention. Studies on similar boiler water additives show they effectively reduce scaling without adverse effects when used at appropriate concentrations in closed industrial systems.

The absence of documented adverse events in the FDA database across decades of use in food manufacturing suggests an established safety record in practical application.

## 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. "Poly(maleic Anhydride), Sodium Salt — Safety, regulation, and evidence." https://additivefacts.com/additives/poly-maleic-anhydride-sodium-salt. Accessed 2026-05-20.