Trisodium phosphate (TSP) is an inorganic compound with the chemical formula Na3PO4, classified under E number E339(iii). It appears as a white granular or crystalline powder that dissolves readily in water. In food manufacturing, TSP serves as a pH buffer, stabilizer, and emulsifier, with particular importance in processed cheese and condensed milk production.
TSP is available in both anhydrous and dodecahydrate forms for food-grade applications. For kosher food producers, its mineral-based synthesis makes it straightforward to certify, and multiple suppliers offer it with kosher, halal, and GMP documentation as standard.
Why Trisodium Phosphate Meets Kosher Standards
Trisodium phosphate is produced through the reaction of phosphoric acid with sodium hydroxide or sodium carbonate. All starting materials are inorganic and mineral-derived, with no animal-based components involved at any stage. This gives TSP a Pareve classification under kosher law, allowing its use in formulations containing either meat or dairy ingredients.
Suppliers such as Ingredi provide kosher-certified trisodium phosphate with letters of certification available for verification. The product is also commonly certified halal and manufactured under ISO and GMP standards. When purchasing, confirm that the kosher certificate is current and issued by a recognized certifying agency.
Food Applications of TSP
Processed cheese manufacturing is one of the primary food uses for trisodium phosphate. It functions as an emulsifying salt, helping to create the smooth, uniform texture characteristic of processed cheese products. TSP interacts with casein proteins to improve their emulsifying capacity, which prevents fat separation during heating and storage.
In condensed milk production, TSP acts as a stabilizer that prevents protein coagulation and maintains the product’s consistency. It also serves as a pH buffer in various food systems, helping to maintain the alkaline conditions needed for certain processing steps. The FDA authorizes its use as a food additive under established safety guidelines.
Regulatory Status and Specifications
Trisodium phosphate holds E number E339(iii) in the European food additive classification system and is listed in the FDA’s food additive inventory. It should not be confused with sodium triphosphate (also called sodium tripolyphosphate), which is a different compound with distinct properties and applications.
Food-grade TSP is available in anhydrous granular form, typically packaged in 25 kg paper bags with polyethylene liners. Key specifications include particle size distribution with no more than 35% retained on 36 mesh (500 microns) and no more than 20% passing through 150 mesh (106 microns). The certificate of analysis should confirm food-grade purity and compliance with FCC standards.
Selecting a Reliable TSP Source
When sourcing kosher trisodium phosphate, evaluate suppliers based on their certification portfolio, manufacturing standards, and documentation practices. A complete supplier package should include the kosher certificate, halal certificate, certificate of analysis, and GMP or ISO certification. Lot traceability is essential for maintaining compliance through the supply chain.
Innophos is one established manufacturer offering trisodium phosphate dodecahydrate specifically for food applications. Multiple Chinese manufacturers also supply food-grade TSP with kosher and halal certifications. Regardless of origin, the quality verification documents should accompany every shipment.
Kosher Trisodium Phosphate Supplier
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