Description

Tetrasodium 7,7'-(Carbonyldiimino)Bis[4-Hydroxy-3-[(6-Sulphonato-2-Naphthyl)Azo]Naphthalene-2-Sulphonate] is a high-purity, water-soluble anionic dye belonging to the class of bis-azo 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, leather, and specialty ink industries for producing vibrant and durable colorations.

Application

• Textile Dyeing: Used for dyeing cotton, wool, silk, and nylon fibers, offering good wash and light fastness.
• Paper Coloring: Imparts intense coloration to paper pulp, surface coatings, and specialty papers.
• Leather Finishing: Applied in the dyeing of leather goods to achieve consistent and deep shades.
• Ink Manufacturing: A key component in the formulation of inks for flexographic, gravure, and inkjet printing.
• Biological Staining: Potential use as a histological stain in laboratory settings due to its specific affinity.
• Liquid Detergent & Soap Coloring: Provides stable color in liquid cleaning and personal care products.

Basic Information

Product Name	Tetrasodium 7,7'-(Carbonyldiimino)Bis[4-Hydroxy-3-[(6-Sulphonato-2-Naphthyl)Azo]Naphthalene-2-Sulphonate]
CAS No.	28706-25-4
Molecular Formula	C45H24N6Na4O19S4
Molecular Weight	1152.9 g/mol (approx.)
Synonyms	Acid Black 194; C.I. 28440; Tetrasodium 4,4'-carbonylbis[imino[7-hydroxy-8-[(6-sulfo-2-naphthalenyl)azo]-3,6-naphthalenedisulfonate]]; 7,7'-(Carbonyldiimino)bis[4-hydroxy-3-[(6-sulfo-2-naphthyl)azo]-2-naphthalenesulfonic acid] tetrasodium salt; Direct Black 194 (related class); Bisazo Black 194; Leather Black 194; Paper Black 194
EINECS	Contact for details

Quality Control

Our production of Tetrasodium 7,7'-(Carbonyldiimino)Bis[4-Hydroxy-3-[(6-Sulphonato-2-Naphthyl)Azo]Naphthalene-2-Sulphonate] adheres to stringent quality protocols to ensure batch-to-batch consistency and performance. Every lot is tested against comprehensive specifications for color value, purity, solubility, and impurity profiles. A detailed Certificate of Analysis (COA) confirming compliance with agreed specifications is provided with each shipment.

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 after each use to prevent moisture absorption, which can affect product performance and flow characteristics.

Specification

Item	Specification
Appearance	Dark blue to black powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 90% (Dye Content)
Moisture (KF)	≤ 8.0 %
Water Solubility	Clear solution at 1% w/v
pH (1% Solution)	7.0 - 9.5
Ash Content	≤ 30.0 %
Heavy Metals (as Pb)	≤ 20 ppm

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