Potassium sodium tartrate

Potassium sodium tartrate (CAS 304-59-6), commercially known as Rochelle salt or E337, is a double salt of tartaric acid used primarily as a buffering agent and sequestrant.

Its ability to stabilize pH and chelate metal ions makes it a functional ingredient in formulations where consistency and shelf stability are critical across food, pharmaceutical, and personal care manufacturing.

In food production, E337 functions as a stabilizer and emulsifying salt in processed cheese, where it controls texture and prevents fat separation during the manufacturing process.

Pharmaceutical manufacturers use it as a buffering agent in oral solutions and effervescent formulations to maintain target pH ranges and ensure the stability of active ingredients.

In personal care, it appears in creams and lotions as a chelating agent, neutralizing trace metals that would otherwise accelerate oxidative degradation of the final product.

It also serves as a laxative active in certain over-the-counter preparations, where regulatory-grade purity is a sourcing requirement for manufacturers and compounding pharmacies.

Potassium sodium tartrate is supplied as a white crystalline powder or granules. It is available in food-grade (FCC), USP, and BP/Ph.Eur. grades to meet compliance requirements.

Bulk quantities are typically offered in 25 kg bags, with documentation packages supporting food and pharmaceutical applications to ensure full traceability and quality assurance.