Description

2,7-Naphthalenedisulfonic acid, 4-amino-3-[[4-[[[4-[(7-amino- 1-hydroxy-3-sulfo-2-naphthalenyl)azo]phenyl]amino ]carbonyl]phenyl]azo]-5-hydroxy-6-(phenylazo) -, sodium salt is a high-purity, polyazo dye intermediate of significant industrial importance. Its complex molecular structure is engineered to provide excellent chromophoric properties and binding affinity, making it a critical precursor for high-performance colorants. This compound is essential for manufacturers in the textile, ink, and specialty chemical sectors who require reliable, consistent quality for producing vibrant and stable dyes and pigments.

Application

• Primary Intermediate for Reactive Dyes: A key building block in the synthesis of high-grade reactive dyes for cotton and cellulose fiber dyeing.
• Production of Acid Dyes: Used in manufacturing acid dyes for coloring wool, silk, and nylon with excellent wash and light fastness.
• Specialty Ink Formulations: Serves as a crucial component in producing pigments for high-quality printing inks, including inks for packaging and security applications.
• Functional Colorant Synthesis: Employed in the development of functional dyes for non-textile applications, such as in laser dyes, optical data storage, and sensitizers.
• Research & Development: Used in chemical R&D laboratories for developing novel chromophores and studying azo dye chemistry and applications.

Basic Information

Product Name	2,7-Naphthalenedisulfonic acid, 4-amino-3-[[4-[[[4-[(7-amino- 1-hydroxy-3-sulfo-2-naphthalenyl)azo]phenyl]amino ]carbonyl]phenyl]azo]-5-hydroxy-6-(phenylazo) -, sodium salt
CAS No.	72245-55-7
Molecular Formula	Contact for details
Molecular Weight	Contact for details
Synonyms	C.I. Reactive Black 5 (key intermediate); Tetrasodium 4-amino-5-hydroxy-3-[[4-[[4-[(7-amino-1-hydroxy-3-sulphonato-2-naphthyl)azo]phenyl]carbamoyl]phenyl]azo]-6-(phenylazo)naphthalene-2,7-disulphonate; Reactive Black 5 precursor; Polyazo dye intermediate; Azo dye sodium salt; 4-Amino-3-[[4-[[[4-[(7-amino-1-hydroxy-3-sulfo-2-naphthalenyl)azo]phenyl]amino]carbonyl]phenyl]azo]-5-hydroxy-6-(phenylazo)-2,7-naphthalenedisulfonic acid sodium salt; Black 5 intermediate
EINECS	Contact for details

Quality Control

Our production of this advanced dye intermediate adheres to stringent quality control protocols to ensure batch-to-batch consistency and purity required for sensitive synthesis processes. Every lot is analyzed using advanced techniques like HPLC to confirm identity and assay. A comprehensive Certificate of Analysis (COA) detailing purity, impurity profile, and physical specifications is provided with each shipment, ensuring full traceability and compliance with your internal quality standards.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This material is light-sensitive (store away from light) and hygroscopic (moisture-sensitive); ensure containers are kept sealed to prevent moisture absorption and degradation.

Specification

Item	Specification
Appearance	Dark powder or granules
Identification (IR)	Conforms to structure
Assay (HPLC)	Min. 95%
Moisture Content	Max. 5.0%
Solubility (in Water)	Complete, clear solution
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.