Description

4-Hydroxy-6-(3-Sulphoanilino)Naphthalene-2-Sulphonic Acid is a specialized naphthalene-based sulphonic acid derivative, serving as a key intermediate in the synthesis of high-value colorants and functional chemicals. Its molecular structure, featuring both sulphonic acid and anilino groups, makes it a versatile building block for creating compounds with specific solubility and chromophoric properties. This product is essential for manufacturers in the dye, pigment, and specialty chemical industries seeking reliable, high-purity intermediates for their production processes.

Application

• Primary Intermediate for Azo Dyes and Pigments: Acts as a crucial coupling component in the synthesis of acid dyes, direct dyes, and reactive dyes for textiles, leather, and paper.
• Specialty Chemical Synthesis: Used in the manufacture of functional chemicals requiring sulphonated naphthalene structures, such as dispersants and optical brighteners.
• Research & Development: Serves as a valuable reagent in organic chemistry research for developing new chromophores and studying sulphonation reactions.
• Photographic Chemicals: Potential application in the synthesis of certain color couplers used in photographic and imaging technologies.

Basic Information

Product Name	4-Hydroxy-6-(3-Sulphoanilino)Naphthalene-2-Sulphonic Acid
CAS No.	25251-42-7
Molecular Formula	C₁₆H₁₃NO₇S₂
Molecular Weight	395.41 g/mol
Synonyms	6-Anilino-4-hydroxy-2-naphthalenesulfonic acid-3'-sulfonic acid; 4-Hydroxy-6-[(3-sulfophenyl)amino]-2-naphthalenesulfonic acid; 6-(3-Sulfoanilino)-4-hydroxy-2-naphthalenesulfonic acid; C.I. Azoic Coupling Component 36; Azoic Coupling Component 36; Naphthol AS-GS; 3'-Sulfo-6'-hydroxy-2-naphthanilide-5-sulfonic acid
EINECS	Contact for details

Quality Control

Our production of 4-Hydroxy-6-(3-Sulphoanilino)Naphthalene-2-Sulphonic Acid adheres to stringent quality management protocols to ensure batch-to-batch consistency and high purity. Each lot is analyzed against rigorous in-house specifications, which typically include identity confirmation by IR spectroscopy, purity assay by HPLC, and control of key impurities. A comprehensive Certificate of Analysis (COA) detailing all test results is provided with every shipment to support your quality assurance and regulatory needs.

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 sealed when not in use to prevent absorption of atmospheric moisture, which can affect product quality and handling properties.

Specification

Item	Specification
Appearance	Off-white to light brown powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	Min. 95.0%
Loss on Drying	Max. 2.0%
Sulphated Ash	Max. 0.5%
Heavy Metals (as Pb)	Max. 20 ppm

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