Description

2,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-, diazotized, coupled with diazotized 3,3'-dichloro[1,1'-biphenyl]-4,4'-diamine and 5,5'-oxybis[1,3-benzenediol], sodium salts is a high-performance, complex diazo dye intermediate. This compound is engineered to deliver exceptional color strength and structural stability for demanding industrial applications. It is primarily utilized by manufacturers in the textile, leather, and specialty ink industries seeking reliable and consistent chromophoric building blocks.

Application

• Primary Intermediate for Azo Dyes: Serves as a critical coupling component in the synthesis of high-grade, polyazo direct dyes and reactive dyes for cellulose fibers like cotton and viscose.
• Leather Coloring Agent: Used in the formulation of dyes for leather finishing, providing deep, penetrating shades with good fastness properties.
• Specialty Ink Production: A key raw material for manufacturing pigments and dyes used in inks for packaging, security printing, and other high-performance applications.
• Paper Dyeing: Employed in the production of dyes for coloring paper and paperboard, offering good affinity and brightness.
• Research & Development: Utilized in chemical R&D laboratories for developing novel chromophores and studying dye-polymer interactions.

Basic Information

Product Name	2,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-, diazotized, coupled with diazotized 3,3'-dichloro[1,1'-biphenyl]-4,4'-diamine and 5,5'-oxybis[1,3-benzenediol], sodium salts
CAS No.	98073-05-3
Molecular Formula	Contact for details
Molecular Weight	Contact for details
Synonyms	C.I. Direct Blue 218; Direct Blue 218; Direct Blue 218 (C.I. 24401); Diazotized 4-Amino-5-hydroxy-2,7-naphthalenedisulfonic acid coupled with diazotized 3,3'-Dichlorobenzidine and Diresorcinol, sodium salts; 3,3'-Dichlorobenzidine - Diresorcinol - 4-Amino-5-hydroxy-2,7-naphthalenedisulfonic acid, tetrazotized, coupled; Sodium 4-amino-5-hydroxy-2,7-naphthalenedisulfonate tetrazonium coupled with tetrazotized 3,3'-dichlorobenzidine and diresorcinol
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. Quality is verified through comprehensive analytical methods including HPLC for purity and spectrophotometry for color value. A Certificate of Analysis (COA) detailing specific lot specifications is provided with every shipment.

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 to prevent absorption of atmospheric moisture.

Specification

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