Description

8-Hydroxy-2-Naphthylamine-3,6-Disulfonic Acid is a high-purity, multi-sulfonated aromatic amine intermediate essential for the synthesis of complex dyes and pigments. Its unique molecular structure, featuring both hydroxyl and amine groups on a naphthalene disulfonic acid backbone, makes it a critical building block for creating vivid and stable colorants. This compound is primarily sought by manufacturers in the dye and pigment industry, as well as by research institutions developing advanced organic materials and analytical reagents.

Application

• Primary Intermediate for Azo Dyes and Pigments: Serves as a key diazo component or coupling agent for producing high-performance, water-soluble azo dyes with excellent color fastness and brightness.
• Manufacture of Reactive Dyes: Used in the synthesis of reactive dyes for textile applications, particularly for cotton and other cellulose fibers, due to its sulfonic acid groups which enhance water solubility and fiber affinity.
• Production of Food, Drug, and Cosmetic (FD&C) Colorants: Acts as a precursor in the manufacturing of certain certified color additives where stringent purity standards are required.
• Chemical Reagent and Research Chemical: Employed in organic synthesis research and as a standard or reagent in analytical chemistry laboratories.
• Specialty Chemical Synthesis: Utilized as a building block for creating more complex organic molecules used in electronics, imaging, and other advanced material sciences.

Basic Information

Product Name	8-Hydroxy-2-Naphthylamine-3,6-Disulfonic Acid
CAS No.	90-40-4
Molecular Formula	C₁₀H₉NO₇S₂
Molecular Weight	319.31 g/mol
Synonyms	8-Hydroxy-2-naphthylamine-3,6-disulfonic acid; 2-Amino-8-hydroxy-3,6-naphthalenedisulfonic acid; 8-Hydroxy-2-amino-3,6-naphthalenedisulfonic acid; 2-Amino-8-naphthol-3,6-disulfonic acid; 8-Hydroxy-2-naphthylamine-3,6-disulfonate; H-acid (Note: Often confused with 1-Amino-8-naphthol-3,6-disulfonic acid, which is the more common "H-acid"); 2-Naphthylamine-8-ol-3,6-disulfonic acid; 90-40-4.
EINECS	201-992-8

Quality Control

Our 8-Hydroxy-2-Naphthylamine-3,6-Disulfonic Acid is produced under a stringent quality management system. Every batch undergoes rigorous analytical testing to ensure it meets precise specifications for identity, purity, and impurity profiles. A comprehensive Certificate of Analysis (COA) detailing assay results, physical characteristics, and trace impurity levels is provided with each shipment to guarantee consistency and 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 a controlled room temperature (15-25°C). This material is hygroscopic (moisture-sensitive); the container must be kept tightly sealed to prevent absorption of atmospheric moisture which can lead to caking or degradation.

Specification

Item	Specification
Appearance	Off-white to light gray powder or crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Water Content (KF)	≤ 2.0%
Sulfated Ash	≤ 0.5%
Related Substances (HPLC)	Total impurities ≤ 2.0%
Solubility (1% in Water)	Clear to slightly hazy solution

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