Description

7,7'-[Ureylenebis[(1-Hydroxy-3-Sodiosulfonaphthalene-6,2-Diyl)Azo(4,1-Phenylene)Azo]]Bis[Naphthalene-1,3-Disulfonic Acid Disodium] Salt is a high-purity, water-soluble azo dye intermediate of significant industrial importance. Its complex, polyfunctional structure provides excellent chromophoric properties and binding affinity, making it a critical precursor for the synthesis of specialized dyes and pigments. This compound is essential for manufacturers in the textile, ink, and specialty coatings industries seeking to produce vivid, stable colors with specific technical performance characteristics.

Application

• Primary Intermediate for Reactive Dyes: Key building block in the synthesis of high-performance reactive dyes for cotton and cellulose fibers.
• Direct Dye Manufacturing: Used in the production of direct dyes for paper, leather, and textile applications requiring good wet fastness.
• Specialty Pigment Synthesis: Serves as a precursor for creating complex organic pigments used in inks, plastics, and coatings.
• Analytical Chemistry Reagent: May be utilized as a colorimetric reagent or indicator in specific analytical procedures.
• Research & Development: Employed in chemical R&D for developing novel chromophores and functional dyes with tailored properties.

Basic Information

Product Name	7,7'-[Ureylenebis[(1-Hydroxy-3-Sodiosulfonaphthalene-6,2-Diyl)Azo(4,1-Phenylene)Azo]]Bis[Naphthalene-1,3-Disulfonic Acid Disodium] Salt
CAS No.	33448-68-9
Molecular Formula	C54H32N10Na4O20S6
Molecular Weight	Approx. 1389.2 g/mol
Synonyms	Direct Black 166 (C.I. 30026); C.I. Direct Black 166; Direct Black 166, disodium salt; 7,7'-[Ureylenebis[(1-hydroxy-3-sodiosulfo-6,2-naphthalenediyl)azo(4,1-phenylene)azo]]bis[1,3-naphthalenedisulfonic acid] disodium salt; C.I. 30026; Direct Black NB; Direct Black NB (C.I. 30026); Direct Black NB disodium salt
EINECS	Contact for details

Quality Control

Our production of this advanced dye intermediate adheres to strict quality management systems to ensure batch-to-batch consistency and high purity. Quality is verified through comprehensive analytical methods including HPLC, UV-Vis spectroscopy, and titration to confirm identity, strength, and impurity profiles. A detailed Certificate of Analysis (COA) documenting purity, assay, and relevant specifications is provided with each shipment to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive); keep the original container tightly sealed to minimize exposure to atmospheric humidity.

Specification

Item	Specification
Appearance	Dark blue to black powder or granules
Identification (IR)	Conforms to structure
Assay (HPLC)	Min. 95%
Moisture Content	Max. 5.0%
Water Solubility	Freely soluble
Heavy Metals (as Pb)	Max. 20 ppm
pH (1% Solution)	6.0 - 8.0

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