Description

2,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-, coupled with diazotized 2-(4-aminophenyl)-1H-benzimidazol-5-amine, diazotized 4-nitrobenzenamine and phenol, sodium salt is a high-purity, complex synthetic dye intermediate. This compound is valued for its ability to impart specific, stable color properties in demanding industrial applications. It is primarily required by manufacturers in the textile, leather, and specialty ink industries for the production of high-performance dyes and pigments.

Application

• Textile Dyeing: A key intermediate for synthesizing azo dyes used in coloring natural and synthetic fibers, particularly for shades requiring high light and wash fastness.
• Leather Finishing: Used in the formulation of dyes for leather goods, providing deep, uniform coloration with good adhesion.
• Specialty Inks: Employed in the production of high-performance inks for packaging, security printing, and other applications demanding color consistency and durability.
• Paper Coloring: Suitable for the manufacture of dyes used in high-quality paper and paperboard products.
• Research & Development: Serves as a critical building block in chemical R&D for developing novel chromophores and functional dyes.
• Pigment Manufacturing: Acts as a precursor in the synthesis of complex organic pigments used in plastics and coatings.

Basic Information

Item	Detail
Product Name	2,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-, coupled with diazotized 2-(4-aminophenyl)-1H-benzimidazol-5-amine, diazotized 4-nitrobenzenamine and phenol, sodium salt
CAS No.	90432-03-4
Molecular Formula	Contact for details
Molecular Weight	Contact for details
Synonyms	C.I. Acid Black 234; C.I. 300229; Acid Black 234; Sodium 4-amino-5-hydroxy-2,7-naphthalenedisulfonate coupled diazo compound; Black 234; Leather Black 234; Azo dye intermediate derived from 2,7-naphthalenedisulfonic acid; 4-Amino-5-hydroxy-2,7-naphthalenedisulfonic acid, diazotized coupling product
EINECS	Contact for details

Quality Control

Our production of this dye intermediate adheres to stringent quality control protocols to ensure batch-to-batch consistency and performance reliability. Every lot is tested against established specifications for identity, purity, and strength. A comprehensive Certificate of Analysis (COA) detailing all test results is provided with each shipment to support your quality assurance processes.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Due to its hygroscopic nature, the container must be kept tightly sealed to prevent moisture absorption, which can affect product performance.

Specification

Item	Specification
Appearance	Dark powder or granules
Identification (IR)	Conforms to standard
Assay (HPLC)	Min. 95%
Moisture Content	Max. 5.0%
Water Solubility	Completely soluble
Heavy Metals (as Pb)	Max. 20 ppm
Ash Content	Contact for details

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