Description

Tetrasodium 7,7'-(Carbonyldiimino)Bis[4-Hydroxy-3-[(2-Methyl-4-Sulphonatophenyl)Azo]Naphthalene-2-Sulphonate] is a high-purity, water-soluble azo dye intermediate and colorant. This compound is valued for its strong chromophore and functional sulphonate groups, which provide excellent solubility and binding properties in aqueous systems. It is a critical raw material for manufacturers in the textile, paper, and specialty ink industries seeking consistent, vibrant coloration.

Application

• Primary Textile Dyeing: Used as a key intermediate in the synthesis of reactive and direct dyes for cotton, wool, and nylon fibers.
• Paper Coloring: Employed in the production of dyes for high-quality paper and paperboard, providing excellent shade consistency.
• Specialty Inks: Serves as a colorant component in the formulation of inks for jet printing and security applications.
• Leather Finishing: Utilized in dye formulations for leather products to achieve deep, uniform colors.
• Biological Staining: Potential use as a staining agent in histological and microbiological applications due to its specific chromogenic structure.
• Research & Development: Acts as a standard or intermediate in chemical research for developing new colorants and functional materials.

Basic Information

Product Name	Tetrasodium 7,7'-(Carbonyldiimino)Bis[4-Hydroxy-3-[(2-Methyl-4-Sulphonatophenyl)Azo]Naphthalene-2-Sulphonate]
CAS No.	28706-33-4
Molecular Formula	C44H28N6Na4O16S4
Molecular Weight	~1128.9 g/mol
Synonyms	Acid Black 210; C.I. 300310; Tetrasodium 4,4'-(carbonyldiimino)bis[5-hydroxy-6-[(2-methyl-4-sulfophenyl)azo]naphthalene-2,7-disulfonate]; 7,7'-Ureylenebis[4-hydroxy-3-(2-methyl-4-sulfophenyl)azo]naphthalene-2-sulfonic acid tetrasodium salt; C.I. Mordant Black 17; Azo Dye Intermediate 28706-33-4; Mordant Black 17, tetrasodium salt
EINECS	Contact for details

Quality Control

Our production of Tetrasodium 7,7'-(Carbonyldiimino)Bis[4-Hydroxy-3-[(2-Methyl-4-Sulphonatophenyl)Azo]Naphthalene-2-Sulphonate] adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing, including HPLC for purity and spectrophotometry for color strength, to ensure it meets precise customer specifications and industry standards. Certificates of Analysis (COA) documenting identity, purity, and impurity profiles are 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 (moisture-sensitive) nature, the container must be kept sealed when not in use to prevent absorption of atmospheric moisture, which can affect product performance and handling.

Specification

Item	Specification
Appearance	Dark brown to black powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Color Strength	98 - 102% (vs. Standard)
Water Content (KF)	≤ 5.0%
Sulphated Ash	≤ 20.0%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (in Water)	Clear solution

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