What is Alpha-butyl-omega-hydroxypoly(oxyethylene) Poly(oxypropylene)?
Alpha-butyl-omega-hydroxypoly(oxyethylene) Poly(oxypropylene), identified by CAS Number 9038-95-3, is a non-ionic surfactant belonging to the class of block copolymers. It is synthesized by combining polyoxyethylene and polyoxypropylene segments with a butyl alkyl group at one end and a hydroxyl group at the other. This chemical structure gives it amphiphilic properties, meaning it has both water-loving (hydrophilic) and water-repelling (hydrophobic) characteristics.
Common Uses
This additive is utilized exclusively as an industrial processing aid, specifically in boiler water treatment applications rather than as a direct food additive. In boiler systems, it functions as an antifoaming agent and surface-active agent, helping to prevent foam formation and improve water treatment efficiency. The compound is designed to work in high-temperature industrial environments where it controls unwanted foam that can interfere with boiler operation and heat transfer efficiency. It is not intended for use in food products and does not appear in the FDA's list of approved food additives.
Safety Assessment
While this substance is not approved for direct food use, the safety profile relevant to its industrial applications shows no reported adverse events in the FDA database and no product recalls associated with this specific compound. The lack of adverse event reports reflects its limited exposure pathway—it is not used in consumer food products and remains confined to closed industrial systems.
The chemical structure of this compound is similar to other polyoxyethylene-polyoxypropylene copolymers that have been studied for toxicological properties. Such polymers are generally considered to have low bioavailability and rapid degradation in biological systems due to their size and molecular structure. However, specific toxicological studies focused exclusively on this particular CAS number appear limited in the publicly available scientific literature.
Because this additive is not used in food intended for human consumption, direct dietary exposure is not a concern for consumers. Industrial workers handling the product in boiler treatment operations would be the primary exposure group, and such use falls under occupational safety regulations rather than food safety standards.
Regulatory Status
This compound is not listed as GRAS (Generally Recognized as Safe) by the FDA for food use. It does not appear on the FDA's approved food additives list and is not authorized for incorporation into human food products. Its regulatory oversight falls under industrial chemical classifications and occupational safety guidelines rather than food additive regulations.
The European Food Safety Authority (EFSA) does not list this substance as an approved food additive in the European Union, consistent with its industrial-only designation. Both regulatory bodies maintain clear distinctions between industrial processing aids used in equipment and food additives used in consumer products.
Key Studies
Published toxicological research specifically examining this exact CAS number (9038-95-3) is limited in the publicly accessible scientific literature. Broader studies on polyoxyethylene-polyoxypropylene block copolymers suggest these compounds have low acute toxicity and are poorly absorbed through the gastrointestinal tract due to their high molecular weight. However, comprehensive safety data from controlled studies on this specific formulation has not been prominently published in major toxicology databases.
The absence of adverse events and recalls in FDA records, combined with the industrial-only application context, suggests this compound has maintained an acceptable safety profile in its intended use. However, the lack of published safety studies limits the ability to make comprehensive safety assessments beyond its approved industrial applications.