Description

Disodium 3-[[4-[(4-Amino-7-Sulphonatonaphthyl)Azo]Phenyl]Azo]-6-[(2,4-Diaminophenyl)Azo]-4-Hydroxynaphthalene-2-Sulphonate is a high-purity, polyazo dye intermediate of significant commercial importance. This compound is valued for its ability to impart deep, complex color shades and its role in synthesizing specialized dyes and pigments. It is primarily needed by manufacturers in the textile, leather, and specialty ink industries seeking to produce high-performance colorants with specific fastness properties.

Application

• Primary intermediate for the synthesis of high-grade, complex azo dyes and pigments used in textile dyeing and printing.
• Key component in the production of leather dyes, offering excellent coverage and color depth.
• Used in the formulation of specialized inks, including those for security printing and high-performance applications.
• Employed in the research and development of novel functional dyes for non-textile applications, such as in optical data storage or sensors.
• Acts as a colorant precursor in the plastics and coatings industries for niche products requiring specific chromatic properties.
• Utilized in analytical chemistry as a reagent or standard for dye analysis and method development.

Basic Information

Product Name	Disodium 3-[[4-[(4-Amino-7-Sulphonatonaphthyl)Azo]Phenyl]Azo]-6-[(2,4-Diaminophenyl)Azo]-4-Hydroxynaphthalene-2-Sulphonate
CAS No.	6409-25-2
Molecular Formula	C32H22N8Na2O8S2
Molecular Weight	764.68 g/mol
Synonyms	Direct Black 22 (Disodium salt); C.I. 35435; Disodium 4-amino-5-hydroxy-3,6-bis[[4-[(7-sulfo-4-aminonaphthalen-1-yl)azo]phenyl]azo]naphthalene-2,7-disulfonate; Polyazo Black Dye Intermediate; 3-[[4-[(4-Amino-7-sulfonato-1-naphthyl)azo]phenyl]azo]-6-[(2,4-diaminophenyl)azo]-4-hydroxynaphthalene-2-sulfonic acid disodium salt; Azo Dye Intermediate 6409-25-2; Direct Black 22 Na Salt
EINECS	Contact for details

Quality Control

Our production of this dye intermediate adheres to stringent quality control protocols to ensure batch-to-batch consistency and high purity. Each lot is tested against established specifications, including identity, assay, and impurity profile. A comprehensive Certificate of Analysis (COA) detailing all test results is provided with every shipment to support your quality assurance processes.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed when not in use to prevent absorption of atmospheric moisture, which can affect product stability and performance.

Specification

Item	Specification
Appearance	Dark blue to black powder or granules
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	≤ 20.0%
Heavy Metals (as Pb)	≤ 20 ppm
Water Solubility	Freely soluble

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