Description

Disodium Hydrogen 4-[[4-[[[(5-Hydroxy-7-Sulphonato-2-Naphthyl)Amino]Carbonyl]Amino]-5-Methoxy-o-Tolyl]Azo]-5-[(Phenylsulphonyl)Oxy]Naphthalene-2,7-Disulphonate is a high-purity, water-soluble synthetic organic dye belonging to the azo chemical class, distinguished by its complex poly-sulphonated structure. This compound is engineered to deliver exceptional color strength, lightfastness, and stability in demanding aqueous applications. It serves as a critical intermediate and functional colorant for manufacturers in the textile, specialty ink, and advanced material sectors who require precise and reliable performance.

Application

• Textile Dyeing: Primary application for dyeing and printing of natural and synthetic fibers, particularly where bright, wash-fast shades are required.
• Inkjet Inks: A key component in the formulation of high-performance inks for digital textile printing and specialty paper.
• Paper Coloring: Used in the production of colored papers and paper products requiring good water solubility and color uniformity.
• Leather Finishing: Employed in dyeing processes for leather goods to achieve vibrant and durable colors.
• Functional Dye Intermediate: Serves as a sophisticated precursor or intermediate in the synthesis of more complex dyes and pigments.
• Research & Development: Utilized in analytical chemistry and material science research as a standard or reactive dye model compound.

Basic Information

Item	Details
Product Name	Disodium Hydrogen 4-[[4-[[[(5-Hydroxy-7-Sulphonato-2-Naphthyl)Amino]Carbonyl]Amino]-5-Methoxy-o-Tolyl]Azo]-5-[(Phenylsulphonyl)Oxy]Naphthalene-2,7-Disulphonate
CAS No.	83949-44-4
Molecular Formula	C35H24N4Na2O15S4
Molecular Weight	914.81 g/mol
Synonyms	Reactive Black 5 (Analog/Precursor); C.I. 20505; Disodium 4-amino-5-hydroxy-3-[[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]azo]-6-(phenylamino)-2,7-naphthalenedisulfonate (related); Azo Dye Intermediate; Poly-sulphonated Azo Dye; Textile Dye Intermediate; Water-soluble Azo Compound
EINECS	Contact for details

Quality Control

Every batch of our Disodium Hydrogen 4-[[4-[[[(5-Hydroxy-7-Sulphonato-2-Naphthyl)Amino]Carbonyl]Amino]-5-Methoxy-o-Tolyl]Azo]-5-[(Phenylsulphonyl)Oxy]Naphthalene-2,7-Disulphonate is produced and tested under a strict quality management system. We ensure compliance with relevant industry specifications for dye intermediates, focusing on consistent purity, color value, and solubility. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and physical parameters is provided with each shipment to guarantee traceability and performance.

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 (moisture-sensitive) nature, the container must be kept sealed when not in use to prevent absorption of atmospheric moisture, 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%
Water Solubility	Freely soluble
Loss on Drying	≤ 5.0%
Sulfated Ash	≤ 20.0%
Heavy Metals (as Pb)	≤ 20 ppm

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