Description

Benzenesulfonic Acid, 2,2'-(1,2-Ethenediyl)Bis[5-Nitro-, Disodium Salt, Reaction Products With 4-[(4-Amino-1-Naphthalenyl)Azo]Benzenesulfonic Acid Monosodium Salt is a complex, high-value azo dye intermediate and specialty chemical. This product is critical for synthesizing vivid and stable colorants, particularly in applications demanding high-performance and light-fastness. It is primarily required by manufacturers in the textile, ink, and specialty coatings industries for producing high-grade dyes and pigments.

Application

• Primary Intermediate for Azo Dyes: Serves as a key building block in the synthesis of high-performance, polyazo direct dyes and acid dyes for textiles like wool, silk, and nylon.
• Ink Manufacturing: Used in the production of specialized printing inks, including those for packaging and security applications, where color consistency and stability are paramount.
• Industrial Pigments: Employed in the manufacture of organic pigments for plastics, paints, and coatings that require specific chromatic properties and durability.
• Research & Development: Utilized in chemical R&D laboratories for developing novel chromophores and studying dye-sensitized systems.
• Paper Coloring: Potential application in the production of high-grade, colored papers where specific dye properties are needed.
• Leather Dyeing: Used in formulations for dyeing leather, providing deep, uniform colors with good fastness properties.

Basic Information

Product Name	Benzenesulfonic Acid, 2,2'-(1,2-Ethenediyl)Bis[5-Nitro-, Disodium Salt, Reaction Products With 4-[(4-Amino-1-Naphthalenyl)Azo]Benzenesulfonic Acid Monosodium Salt
CAS No.	1325-65-1
Molecular Formula	Contact for details
Molecular Weight	Contact for details
Synonyms	Direct Black 19 (principal component); C.I. 35255; Azo Black; Pontamine Black E; Benzenesulfonic acid, 2,2'-(1,2-ethenediyl)bis[5-nitro-, disodium salt, reaction products with 4-[(4-amino-1-naphthalenyl)azo]benzenesulfonic acid monosodium salt; 2,2'-(Ethene-1,2-diyl)bis(5-nitrobenzenesulfonic acid) disodium salt, reaction products with 4-[(4-aminonaphthalen-1-yl)diazenyl]benzenesulfonic acid sodium salt
EINECS	Contact for details

Quality Control

Our production of this dye intermediate adheres to strict quality control protocols to ensure batch-to-batch consistency and performance in downstream synthesis. Quality is verified through analytical methods including HPLC, spectrophotometry, and titration. A comprehensive Certificate of Analysis (COA) detailing purity, strength, and impurity profiles is provided with every shipment to support your quality assurance and regulatory needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from strong oxidizing agents. Due to the complex organic nature of this material, prolonged exposure to elevated temperatures or direct light should be avoided to maintain stability.

Specification

Item	Specification
Appearance	Dark blue-black to black powder or granules
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	Min. 90% (as Direct Black 19)
Moisture Content	Max. 5.0%
Ash Content	Max. 15.0%
Water Solubility	Freely soluble
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.