Description

Tetrasodium 3,3'-(Carbonyldiimino)Bis[6-[[1-Hydroxy-6-(Phenylamino)-3-Sulphonato-2-Naphthyl]Azo]Benzoate] is a high-purity, water-soluble anionic dye belonging to the class of polyazo compounds. This product is valued for its excellent color strength, stability, and compatibility in demanding industrial formulations. It is primarily required by manufacturers in the textile, paper, and specialty ink industries for producing consistent and vibrant hues.

Application

• Textile Dyeing: As a direct or reactive dye for coloring cotton, wool, silk, and nylon fibers, offering good wash and light fastness.
• Paper Coloring: For tinting and surface coating of high-quality papers, including decorative and packaging materials.
• Ink Manufacturing: A key colorant in the production of inks for flexographic, gravure, and inkjet printing applications.
• Leather Finishing: Used in dye baths for leather goods to achieve deep, uniform coloration.
• Biological Staining: Potential use as a histological stain in laboratory settings due to its specific affinity.
• Specialty Coatings: Incorporation into industrial paints and coatings where specific color properties are required.

Basic Information

Product Name	Tetrasodium 3,3'-(Carbonyldiimino)Bis[6-[[1-Hydroxy-6-(Phenylamino)-3-Sulphonato-2-Naphthyl]Azo]Benzoate]
CAS No.	6661-29-6
Molecular Formula	C52H32N8Na4O16S2
Molecular Weight	~1152.98 g/mol
Synonyms	Direct Black 19 (Tetrasodium Salt); C.I. 35255; Tetrasodium 6,6'-[(Carbonylbis(imino-3,1-phenylene-2,1-diazenediyl))bis(1-hydroxy-6-(phenylamino)-3-naphthalenesulfonate)]; Benzoic acid, 6,6'-[(carbonylbis(imino-3,1-phenylene-2,1-diazenediyl))bis[1-hydroxy-6-(phenylamino)-3-naphthalenesulfonic acid]], tetrasodium salt; Polyazo Black Dye; Azo Black 19; Tetrasodium Salt of Direct Black 19
EINECS	Contact for details

Quality Control

Our production of Tetrasodium 3,3'-(Carbonyldiimino)Bis[6-[[1-Hydroxy-6-(Phenylamino)-3-Sulphonato-2-Naphthyl]Azo]Benzoate] adheres to a stringent quality management system. Every batch undergoes comprehensive analytical testing to ensure consistent purity, color value, and performance. A detailed Certificate of Analysis (COA) providing specifications for assay, impurity profile, and physical parameters is supplied with each shipment to guarantee traceability and compliance.

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). Keep away from incompatible materials and sources of ignition. The product is light-sensitive and should be stored away from direct light exposure to maintain stability.

Specification

Item	Specification
Appearance	Dark brown to black powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Solubility	Completely soluble
Ash Content (Sulfated)	Contact for details
Heavy Metals (as Pb)	≤ 20 ppm

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