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.

Where is Potassium sodium tartrate used?

• Food: stabilizer and emulsifying salt in processed cheese, controlling texture and preventing fat separation
• Pharmaceuticals: buffering agent in oral solutions and effervescent formulations
• Personal care: chelating agent in creams and lotions, neutralizing trace metals
• It also serves as a laxative active in certain over-the-counter preparations.

Good to know: Regulatory-grade purity is a sourcing requirement for laxative manufacturers and compounding pharmacies.

Commercial specifications

• Bulk quantities typically offered in 25 kg bags
• Documentation packages supporting food and pharmaceutical applications