Description

Tetrasodium 7,7'-(Carbonyldiimino)Bis[4-Hydroxy-3-[(4-Sulphonatophenyl)Azo]Naphthalene-2-Sulphonate] is a high-purity, water-soluble synthetic dye belonging to the class of azo dyes. This compound matters for its exceptional color strength and stability, making it a critical component for achieving vibrant and durable hues in demanding industrial applications. It is primarily needed by manufacturers in the textile, ink, and specialty coatings industries who require reliable and consistent colorants.

Application

• Textile Dyeing: Used for coloring natural and synthetic fibers, particularly valued for its wash and light fastness properties.
• Ink Formulation: A key pigment for manufacturing high-quality printing inks, including those for packaging and publications.
• Industrial Coatings: Incorporated into paints and coatings for plastics, metals, and other substrates requiring color stability.
• Paper Coloration: Employed in the production of colored papers and paper products.
• Leather Finishing: Used in dyes for leather goods to provide rich, lasting color.
• Specialty Chemical Synthesis: Serves as an intermediate or colorant in the synthesis of other complex chemical products.

Basic Information

Item	Details
Product Name	Tetrasodium 7,7'-(Carbonyldiimino)Bis[4-Hydroxy-3-[(4-Sulphonatophenyl)Azo]Naphthalene-2-Sulphonate]
CAS No.	56878-33-2
Molecular Formula	C40H22N6Na4O16S4
Molecular Weight	1050.86 g/mol (approx.)
Synonyms	Acid Black 194; C.I. 28440; Tetrasodium 4,4'-carbonylbis[imino[7-hydroxy-8-[(4-sulfophenyl)azo]-2-naphthalenesulfonate]]; 7,7'-(Carbonyldiimino)bis[4-hydroxy-3-[(4-sulfophenyl)azo]-2-naphthalenesulfonic acid] tetrasodium salt; Azo Dye C.I. Acid Black 194; Direct Black 194 (related class); Tetrasodium 7,7'-(carbonyldiimino)bis(4-hydroxy-3-((4-sulfonatophenyl)diazenyl)naphthalene-2-sulfonate)
EINECS	Contact for details

Quality Control

Our Tetrasodium 7,7'-(Carbonyldiimino)Bis[4-Hydroxy-3-[(4-Sulphonatophenyl)Azo]Naphthalene-2-Sulphonate] is produced under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure it meets precise specifications for color value, purity, and chemical composition. Certificates of Analysis (COA) documenting these results are available upon request to support your quality assurance and regulatory compliance needs.

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 tightly sealed after opening to prevent absorption of atmospheric moisture, which can affect product performance.

Specification

Item	Specification
Appearance	Dark blue to black powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Color Strength	100 ± 5% (vs. Standard)
Moisture (Karl Fischer)	≤ 5.0%
Water Solubility	Clear solution
pH (1% Solution)	7.0 - 9.0
Heavy Metals (as Pb)	≤ 20 ppm

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