Description

2,7-Naphthalenedisulfonic Acid, 5-(Benzoylamino)-4-Hydroxy-1-[[4-[[[4- [(4-Sulfophenyl)Azo]Phenyl]Amino]Carbonyl]Phenyl]Azo]-, Trisodium Salt is a high-purity, water-soluble azo dye intermediate and specialty chemical. This compound is valued for its excellent chromophoric properties and ability to form stable, intense colorants. It is primarily required by manufacturers in the textile, ink, and specialty polymer industries for producing high-performance dyes and functional colorants.

Application

• Primary Intermediate for Azo Dyes: Key building block for synthesizing acid dyes and direct dyes used in textile coloring, particularly for polyamide and protein fibers like wool and silk.
• Inkjet and Printing Inks: Used in the formulation of high-quality inks where color strength, solubility, and lightfastness are critical.
• Functional Dye for Polymers: Imparts color to engineering plastics and specialty polymers where thermal stability is required.
• Biological Staining Reagent: Potential use in histology and cytology as a staining agent for microscopic analysis.
• Research & Development: Serves as a standard or starting material in chemical research for developing new chromophores and functional materials.
• Paper Coloring: Applicable in the production of colored papers requiring specific dye properties.

Basic Information

Product Name	2,7-Naphthalenedisulfonic Acid, 5-(Benzoylamino)-4-Hydroxy-1-[[4-[[[4- [(4-Sulfophenyl)Azo]Phenyl]Amino]Carbonyl]Phenyl]Azo]-, Trisodium Salt
CAS No.	6949-17-3
Molecular Formula	C35H22N5Na3O13S3
Molecular Weight	879.71 g/mol
Synonyms	Acid Black 172; C.I. 15711; Trisodium 5-benzamido-4-hydroxy-3-[[4-[[4-(4-sulfonatophenyl)diazenyl]phenyl]carbamoyl]phenyl]diazenyl-2,7-naphthalenedisulfonate; Benzo Black; 5-Benzoylamino-4-hydroxy-3-((4-((4-(4-sulfophenylazo)phenyl)carbamoyl)phenyl)azo)-2,7-naphthalenedisulfonic acid trisodium salt; Azo Black 172; Direct Black 172 (related class).
EINECS	Contact for details

Quality Control

Our production of this dye intermediate adheres to strict quality management systems. Every batch is analyzed to ensure consistent purity, color value, and chemical composition. Certificates of Analysis (COA) detailing key parameters such as assay, impurity profile, and solubility are provided with each shipment. We support compliance with relevant global chemical inventories and regulations.

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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Dark blue to black powder or granules
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture (KF)	≤ 5.0%
Sulfated Ash	Contact for details
Solubility (in Water)	Freely soluble
Heavy Metals (as Pb)	≤ 20 ppm

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