Description

Trisodium 4-Hydroxy-3-[[2-Methoxy-5-Methyl-4-[[2-(Sulphonatooxy)Ethyl]Sulphonyl]Phenyl]Azo]-6-[(3-Sulphonatophenyl)Amino]Naphthalene-2-Sulphonate is a high-purity, water-soluble anionic dye intermediate characterized by its complex, multi-sulfonated structure. This compound is engineered for exceptional color strength and stability, making it a critical component in the synthesis of high-performance dyes. It is primarily sought by manufacturers in the textile, ink, and specialty coatings industries who require reliable and consistent chromophores for demanding applications.

Application

• Primary Intermediate for Reactive Dyes: Key building block in the synthesis of high-grade reactive dyes for cotton, wool, and nylon.
• Textile Coloration: Used in dye formulations for achieving vibrant, wash-fast colors in textile printing and dyeing processes.
• Inkjet Inks: Serves as a chromophore in the production of professional and industrial pigment inks, offering excellent color gamut and stability.
• Specialty Coatings and Paints: Imparts color in coatings where lightfastness and chemical resistance are paramount.
• Paper Dyeing: Employed in the coloration of high-quality papers and specialty boards.
• Biological Staining: Potential use as a staining agent in histological and cytological applications due to its anionic properties.

Basic Information

Product Name	Trisodium 4-Hydroxy-3-[[2-Methoxy-5-Methyl-4-[[2-(Sulphonatooxy)Ethyl]Sulphonyl]Phenyl]Azo]-6-[(3-Sulphonatophenyl)Amino]Naphthalene-2-Sulphonate
CAS No.	25251-40-5
Molecular Formula	C26H21N3Na3O16S4
Molecular Weight	838.66 g/mol (as trisodium salt)
Synonyms	Reactive Black 5 Precursor; C.I. Reactive Black 5 Intermediate; Trisodium 6-Amino-4-hydroxy-3-[[7-(sulfonatomethyl)-5-sulfo-2-methoxy-1-naphthyl]azo]-5-[[4-[[2-(sulfonatooxy)ethyl]sulfonyl]phenyl]azo]naphthalene-2,7-disulfonate (related isomer); Polyazo Dye Intermediate; Multi-sulfonated Azo Dye; 25251-40-5; Anionic Dye Intermediate
EINECS	Contact for details

Quality Control

Every batch of our dye intermediate is produced under strict quality management systems to ensure batch-to-batch consistency and high purity. We provide comprehensive Certificates of Analysis (COA) detailing key parameters such as assay, impurity profile, and solubility. Our quality protocols are designed to meet the stringent requirements of the textile and specialty chemical industries.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled 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 and handling.

Specification

Item	Specification
Appearance	Dark blue to black powder or granules
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Water Solubility	Freely soluble
Heavy Metals (as Pb)	≤ 20 ppm
pH (1% Solution)	7.0 - 9.0

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