Description

4-Hydroxybenzenesulfonic Acid Sodium Salt Dihydrate is a versatile organic salt widely used as a key intermediate and reagent in fine chemical synthesis. Its significance lies in its dual functionality, combining a phenolic hydroxyl group with a sulfonate moiety, making it valuable for coupling reactions and as a building block for more complex molecules. This compound is essential for manufacturers and R&D laboratories in the pharmaceutical, dye, and specialty chemical industries seeking reliable, high-purity raw materials.

Application

• Pharmaceutical Intermediate: A crucial building block in the synthesis of various active pharmaceutical ingredients (APIs), particularly those requiring phenolic sulfonate structures.
• Dye and Pigment Manufacturing: Serves as a key intermediate for producing azo dyes and other colorants, where it acts as a coupling component.
• Chemical Synthesis Reagent: Used in organic synthesis for introducing sulfonate groups or as a protected phenolic precursor in multi-step reactions.
• Research & Development: Employed in academic and industrial R&D labs for developing new chemical entities and process optimization studies.
• Electroplating Additives: Can function as an additive in certain electroplating baths to improve bath stability and deposit quality.
• Photographic Chemicals: Historically used in the formulation of certain photographic developers and processing agents.

Basic Information

Product Name	4-Hydroxybenzenesulfonic Acid Sodium Salt Dihydrate
CAS No.	10580-19-5
Molecular Formula	C6H9NaO7S
Molecular Weight	248.19 g/mol
Synonyms	Phenol-4-sulfonic Acid Sodium Salt Dihydrate; Sodium 4-Hydroxybenzenesulfonate Dihydrate; Sodium Phenol-4-sulfonate Dihydrate; p-Hydroxybenzenesulfonic Acid Sodium Salt Dihydrate; Sodium p-Phenolsulfonate Dihydrate; 4-Hydroxybenzenesulfonate Sodium Salt Dihydrate; p-Phenolsulfonic Acid Sodium Salt Dihydrate
EINECS	Contact for details

Quality Control

Our 4-Hydroxybenzenesulfonic Acid Sodium Salt Dihydrate is produced under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure it meets precise specifications for identity, purity, and impurity profiles. Certificates of Analysis (COA) detailing results for assay, related substances, loss on drying, and residual solvents are provided and available upon request, supporting compliance in cGMP and ISO environments.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after each use to prevent absorption of atmospheric moisture, which can affect product quality and handling properties.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 98.0%
Loss on Drying	13.0 - 16.0%
Related Substances (HPLC)	Total impurities ≤ 2.0%
Heavy Metals	≤ 20 ppm
Residual Solvents	Meets ICH guidelines
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.