Description

4-Amino-3-Hydroxybenzenesulfonic Acid is a versatile sulfonated aniline derivative that serves as a critical intermediate in the synthesis of complex organic molecules. Its unique structure, featuring both amino and hydroxy functional groups on the benzenesulfonic acid backbone, makes it a valuable building block for creating dyes, pigments, and pharmaceutical active ingredients. This compound is essential for manufacturers in the fine chemical, specialty dye, and life science industries seeking to develop high-performance and colorfast products. We supply this material with a focus on consistent purity and reliable global logistics to support your production processes.

Application

• Dye and Pigment Intermediate: A key precursor in the synthesis of azo dyes, acid dyes, and reactive dyes for textiles, leather, and paper.
• Pharmaceutical Synthesis: Used as a building block in the manufacture of certain APIs (Active Pharmaceutical Ingredients) and diagnostic agents.
• Chemical Research & Development: Employed in organic synthesis and as a standard or reagent in analytical chemistry laboratories.
• Photographic Chemicals: Can be utilized in the production of certain photographic developers and sensitizers.
• Corrosion Inhibitor Formulation: Acts as a component in specialty chemical formulations designed to prevent metal corrosion.
• Complexing Agent: Its functional groups allow it to chelate certain metal ions, finding use in water treatment or metal finishing processes.

Basic Information

Product Name	4-Amino-3-Hydroxybenzenesulfonic Acid
CAS No.	2592-14-5
Molecular Formula	C6H7NO4S
Molecular Weight	189.19 g/mol
Synonyms	3-Amino-4-hydroxybenzenesulfonic acid; 4-Amino-3-phenolsulfonic acid; 1-Amino-2-hydroxy-5-sulfobenzene; 2-Hydroxy-5-sulfoaniline; 5-Amino-2-hydroxybenzenesulfonic acid; 3-Hydroxy-4-aminobenzenesulfonic acid; Orthanilic acid, 3-hydroxy-; 4-Amino-3-hydroxybenzenesulphonic acid
EINECS	219-985-7

Quality Control

Our 4-Amino-3-Hydroxybenzenesulfonic Acid is produced under a strict quality management system. Every batch undergoes comprehensive analytical testing to ensure it meets high-purity standards suitable for industrial and fine chemical applications. A Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with each shipment, ensuring full traceability and compliance with 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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after opening to prevent absorption of atmospheric moisture, which can affect product quality.

Specification

Item	Specification
Appearance	Off-white to light brown crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
Residue on Ignition (Sulfated Ash)	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm

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