Description

2,7-Naphthalenedisulfonic acid, 4-amino-6-5-4-8-amino-1-hydroxy-3,6-disulfo-7-4-2-(sulfooxy)ethylsulfonylphenylazo-2-naphthalenylazobenzoylamino-2-sulfophenylazo-5-hydroxy-3-4-2-(sulfooxy)ethylsulfonylphenylazo-, sodium salt is a complex, high-purity synthetic dye intermediate belonging to the class of polyazo dyes. This compound is engineered to deliver exceptional color strength, brightness, and fastness properties in demanding applications. It is primarily utilized by manufacturers in the textile, ink, and specialty coatings industries who require advanced chromophores for high-performance products.

Application

• Textile Dyeing: As a key intermediate for producing high-grade, wash-fast, and light-fast dyes for synthetic fibers like nylon and polyester.
• Ink Manufacturing: Used in the formulation of industrial inks, including inks for digital textile printing, to achieve vibrant and durable colors.
• Specialty Coatings: Serves as a colorant in coatings where chemical resistance and color stability are critical.
• Leather Processing: Employed in the dyeing of leather goods to provide deep, uniform coloration.
• Paper Coloring: Used for specialty paper products requiring specific, stable colorants.
• Research & Development: Acts as a reference standard or building block in the synthesis of novel dye molecules and functional materials.

Basic Information

Product Name	2,7-Naphthalenedisulfonic acid, 4-amino-6-5-4-8-amino-1-hydroxy-3,6-disulfo-7-4-2-(sulfooxy)ethylsulfonylphenylazo-2-naphthalenylazobenzoylamino-2-sulfophenylazo-5-hydroxy-3-4-2-(sulfooxy)ethylsulfonylphenylazo-, sodium salt
CAS No.	161935-19-9
Molecular Formula	Contact for details
Molecular Weight	Contact for details
Synonyms	C.I. Reactive Black 5 (sodium salt); Reactive Black 5; Remazol Black B; Reactive Black B; Polyazo black dye intermediate; 4-Amino-5-hydroxy-3-((4-((2-(sulfooxy)ethyl)sulfonyl)phenyl)azo)-6-((7-((4-((2-amino-1-hydroxy-3,6-disulfo-7-((4-((2-(sulfooxy)ethyl)sulfonyl)phenyl)azo)-2-naphthyl)amino)carbonyl)phenyl)azo)-1-hydroxy-3,6-disulfo-2-naphthyl)azo)-2,7-naphthalenedisulfonic acid, sodium salt
EINECS	Contact for details

Quality Control

Our production of this dye intermediate adheres to strict quality management systems to ensure batch-to-batch consistency and purity. 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 to 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 room temperature (15-25°C). This material is hygroscopic (moisture-sensitive); keep the container tightly sealed when not in use to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Dark blue to black powder or granules
Identification (IR)	Conforms to structure
Assay (HPLC)	Min. 90%
Moisture Content	Max. 5.0%
Water Solubility	Freely soluble
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.