Description

2-Naphthalenesulfonic Acid, 6-(2,4-Diaminophenyl)Azo-3-4-(2,4-Diaminophenyl)Azo-3-Sulfophenylazo-4-Hydroxy-, Disodium Salt is a high-purity, synthetic azo dye intermediate of significant industrial importance. This compound is valued for its ability to impart deep, stable colors and its role in the synthesis of complex dyes and pigments. It is primarily required by manufacturers in the textile, leather, and specialty ink industries seeking consistent quality for high-performance colorant production.

Application

• Primary Intermediate for Azo Dyes & Pigments: Serves as a key building block in the synthesis of high-grade, complex azo dyes used for textiles (cotton, wool, silk) and leather.
• Specialty Ink Formulation: Used in the production of inks for security printing, packaging, and other applications requiring specific color fastness and chemical stability.
• Research & Development: Employed in chemical R&D for developing novel chromophores and studying dye-polymer interactions.
• Analytical Chemistry: Can be utilized as a staining agent or a standard in chromatographic and spectroscopic analysis within quality control laboratories.

Basic Information

Product Name	2-Naphthalenesulfonic Acid, 6-(2,4-Diaminophenyl)Azo-3-4-(2,4-Diaminophenyl)Azo-3-Sulfophenylazo-4-Hydroxy-, Disodium Salt
CAS No.	6360-26-5
Molecular Formula	C34H24N8Na2O10S2
Molecular Weight	806.76 g/mol
Synonyms	Direct Black 38 (principal commercial name); C.I. 30235; Benzo Black; Pontamine Black; Azo Black; 6,6'-((3,3'-Disulfo[1,1'-biphenyl]-4,4'-diyl)bis(azo))bis(4-amino-3-hydroxy-2-naphthalenesulfonic acid) disodium salt; Disodium 4-amino-3-hydroxy-7,7'-((3,3'-disulfo(1,1'-biphenyl)-4,4'-diyl)bis(azo))bis(2-naphthalenesulfonate)
EINECS	228-872-2

Quality Control

Our production of this azo dye intermediate adheres to stringent quality control protocols to ensure batch-to-batch consistency and high purity. Quality is verified through comprehensive analytical testing including HPLC, spectrophotometry, and titration methods. Certificates of Analysis (COA) detailing purity, identity, and impurity profiles are available for every batch upon request, supporting your quality assurance and regulatory compliance 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). This product is hygroscopic (moisture-sensitive); ensure the container is kept tightly sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Dark brown to black powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content (KF)	≤ 5.0%
Ash Content	≤ 20.0%
Water Solubility	Freely soluble

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