Description

2,7-Naphthalenedisulfonic acid, 4-amino-6-[[5-[[4-chloro-6-[[3-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]amino]-1,3,5-triazin-2-yl]amino]-2-sulfophenyl]azo]-5-hydroxy-3-[(4-sulfophenyl)azo]-, pentasodium salt is a high-purity, complex anionic dye intermediate belonging to the class of reactive azo dyes. This compound is engineered to deliver exceptional color strength and covalent bonding properties with cellulosic fibers, ensuring vibrant, wash-fast coloration. It is a critical raw material for manufacturers in the textile industry seeking to produce high-quality, durable dyes for cotton, viscose, and other natural fibers.

Application

• Primary Intermediate for Reactive Dyes: Synthesis of high-performance reactive red and black dyes for the textile industry.
• Cotton Dyeing: Key component in formulations for exhaust and continuous dyeing processes of cotton fabrics and yarns.
• Viscose and Linen Coloration: Used in dyeing other cellulosic fibers to achieve excellent fastness properties.
• Ink Formulation: Potential use as a colorant in specialized inkjet inks requiring specific chromatic properties and stability.
• Research & Development: Serves as a standard or building block in chemical R&D for developing new chromophores and functional dyes.

Basic Information

Item	Details
Product Name	2,7-Naphthalenedisulfonic acid, 4-amino-6-[[5-[[4-chloro-6-[[3-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]amino]-1,3,5-triazin-2-yl]amino]-2-sulfophenyl]azo]-5-hydroxy-3-[(4-sulfophenyl)azo]-, pentasodium salt
CAS No.	80156-94-1
Molecular Formula	C35H22ClN10Na5O20S6 (or related sodium salt form)
Molecular Weight	Contact for details
Synonyms	Reactive Black 5 (Pentasodium Salt); C.I. Reactive Black 5; Remazol Black B; Lanasol Black B; Sumifix Black B; Drimarene Black B; Levafix Black EB; CAS 17095-24-8 (related parent acid form)
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 performance. Quality is verified through comprehensive analytical testing including HPLC for purity and assay, spectrophotometry for color strength, and controlled impurity profiling. A detailed Certificate of Analysis (COA) documenting all relevant 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 to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Black to dark blue powder or granules
Identification (IR)	Conforms to standard
Assay (HPLC)	Min. 90%
Color Strength	100 ± 5% (vs. Standard)
Moisture Content	Max. 5.0%
Water Solubility	Completely soluble
pH (1% Solution)	6.0 - 8.0

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