Description

6-[(2,4-Diaminophenyl)azo]-3-[[4-[[4-[[7-[(2,4-diamino-5-sulfophenyl)azo]-1-hydroxy-3-sulfo-2-naphthalenyl]azo]-2-sulfophenyl]amino]phenyl]azo]-4-hydroxy-2-naphthalenesulfonic acid tetrasodium salt is a high-purity, complex azo dye intermediate essential for producing deep, vibrant colors with excellent fastness properties. This compound is critical for manufacturers requiring consistent and reliable chromophores for high-performance dye synthesis. It is primarily utilized by the textile, leather, and specialty ink industries for creating durable black and dark shades.

Application

• Textile Dyeing: As a key intermediate for synthesizing high-grade direct, reactive, and acid dyes for cotton, wool, silk, and nylon.
• Leather Finishing: Used in the production of dyes for imparting deep, uniform color to leather goods with good light and rub fastness.
• Ink Manufacturing: Serves as a precursor for pigments and dyes used in specialty inks, including inks for packaging and security printing.
• Paper Coloration: Employed in the synthesis of dyes for high-quality paper products requiring specific color depth and stability.
• Research & Development: Used as a standard or building block in chemical research for developing new polymeric dyes and colorants.
• Biological Staining: Potential use as an intermediate for histological stains due to its polyazo and diamine structure.

Basic Information

Product Name	6-[(2,4-Diaminophenyl)azo]-3-[[4-[[4-[[7-[(2,4-diamino-5-sulfophenyl)azo]-1-hydroxy-3-sulfo-2-naphthalenyl]azo]-2-sulfophenyl]amino]phenyl]azo]-4-hydroxy-2-naphthalenesulfonic acid tetrasodium salt
CAS No.	73003-68-6
Molecular Formula	C44H30N12O14S4 • 4Na
Molecular Weight	~1190.0 g/mol (as tetrasodium salt)
Synonyms	Direct Black 22 (Tetrasodium Salt); C.I. 35435; Tetrasodium 6-[(2,4-diaminophenyl)azo]-3-[[4-[[4-[[7-[(2,4-diamino-5-sulfophenyl)azo]-1-hydroxy-3-sulfo-2-naphthalenyl]azo]-2-sulfophenyl]amino]phenyl]azo]-4-hydroxy-2-naphthalenesulfonate; Polyazo Black Dye Intermediate; Azo Dye Intermediate for Direct Black; 2-Naphthalenesulfonic acid, 6-[(2,4-diaminophenyl)azo]-3-[[4-[[4-[[7-[(2,4-diamino-5-sulfophenyl)azo]-1-hydroxy-3-sulfo-2-naphthalenyl]azo]-2-sulfophenyl]amino]phenyl]azo]-4-hydroxy-, tetrasodium salt
EINECS	Contact for details

Quality Control

Our production of this advanced dye intermediate adheres to strict quality management systems. Every batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise customer specifications and industry standards. A detailed Certificate of Analysis (COA) is provided with each shipment, documenting key parameters such as assay, impurity profile, and heavy metal content.

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 tightly sealed to prevent absorption of atmospheric moisture, which can affect product performance and stability.

Specification

Item	Specification
Appearance	Dark blue-black to black powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	Min. 95%
Loss on Drying	Max. 5.0%
Sulfated Ash	Consistent with tetrasodium salt form
Heavy Metals (as Pb)	Max. 20 ppm
Water Solubility	Freely soluble in water

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