Description

4-Hydroxybenzenesulfonic acid, disodium salt is a versatile organic salt widely used as a key intermediate and functional additive in industrial synthesis. Its value lies in its dual functionality, offering both phenolic and sulfonate groups for reactions and product enhancement. This compound is essential for manufacturers in the pharmaceutical, dye, and polymer industries seeking reliable and high-purity chemical building blocks.

Application

• Pharmaceutical Intermediate: Acts as a crucial precursor in the synthesis of various active pharmaceutical ingredients (APIs) and diagnostic agents.
• Dye and Pigment Manufacturing: Serves as a coupling agent and intermediate in the production of azo dyes and other colorants.
• Polymer Modification: Used to introduce sulfonate groups into polymers, enhancing properties like hydrophilicity and dyeability.
• Electroplating Additive: Functions as a brightening agent and stabilizer in electroplating baths.
• Photographic Chemical: Employed in certain photographic developers and processing solutions.
• Research & Development: A valuable reagent in organic synthesis and chemical research laboratories.

Basic Information

Product Name	4-Hydroxybenzenesulfonic acid, disodium salt
CAS No.	20896-31-5
Molecular Formula	C6H6Na2O4S
Molecular Weight	232.16 g/mol
Synonyms	Disodium 4-hydroxybenzenesulfonate; Disodium p-phenolsulfonate; Phenol-4-sulfonic acid disodium salt; p-Hydroxybenzenesulfonic acid disodium salt; Sodium phenolsulfonate; 1-Hydroxy-4-sulfobenzene disodium salt; EINECS 244-104-1
EINECS	244-104-1

Quality Control

Our 4-Hydroxybenzenesulfonic acid, disodium salt is produced under a stringent quality management system. Each batch undergoes comprehensive analytical testing to ensure it meets precise specifications for identity, purity, and impurity profiles. Certificates of Analysis (COA) documenting these results are available for every shipment to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive); ensure containers are kept tightly sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
Heavy Metals (as Pb)	≤ 20 ppm
Residue on Ignition	≤ 0.1%
pH (5% solution)	6.0 - 8.0

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.