Sodium p-toluenesulfonate

Sodium p-toluenesulfonate (CAS 657-84-1) is an aromatic sulfonate salt commercially available under trade names including Naxonate ST and Naxonate 4ST, and also referred to as sodium tosylate. It carries no assigned E-code and is classified under HS code 29041000. The molecular formula is C7H8O3S.Na.

In textile and leather processing, it functions as a hydrotrope, increasing the aqueous solubility of poorly soluble dyes and finishing agents to improve bath stability and penetration depth. In coatings and adhesive formulations, it acts as a wetting agent by reducing interfacial tension, promoting substrate adhesion. It also serves as a phase-transfer catalyst in organic synthesis applications.

Sodium p-toluenesulfonate is supplied as a white powder and is subject to REACH registration requirements for EU market placement. Procurement teams should confirm supplier compliance documentation, including Safety Data Sheets aligned with Regulation (EC) No 1907/2006. Standard industrial packaging formats typically include 25 kg bags or bulk quantities on request.