Description

5-[[2,4-Diamino-5-[(8-hydroxy-6-sodiosulfo-2-naphthalenyl)azo]phenyl]azo]-4-hydroxy-3-[[4'-[(4-hydroxyphenyl)azo][1,1'-biphenyl]-4-yl]azo]naphthalene-2,7-disulfonic acid disodium salt is a high-purity, polyazo dye intermediate of significant commercial importance. This compound is valued for its ability to impart deep, vibrant colors with excellent fastness properties in demanding applications. It is primarily sought by manufacturers in the textile, leather, and specialty ink industries for the production of high-performance dyes and pigments.

Application

• Textile Dyeing: A key intermediate for synthesizing high-grade, wash-fast azo dyes for cotton, wool, and synthetic fibers.
• Leather Finishing: Used in the formulation of dyes that provide rich, uniform coloration to leather goods with good light and rub fastness.
• Specialty Inks: Serves as a precursor for pigments used in high-quality printing inks, including those for packaging and security printing.
• Paper Coloring: Employed in the production of dyes for specialty papers requiring intense and stable coloration.
• Research & Development: Utilized as a standard or building block in chemical research for developing new chromophores and functional materials.
• Plastics and Polymers: Can be incorporated as a colorant masterbatch intermediate for certain engineering plastics.

Basic Information

Product Name	5-[[2,4-Diamino-5-[(8-hydroxy-6-sodiosulfo-2-naphthalenyl)azo]phenyl]azo]-4-hydroxy-3-[[4'-[(4-hydroxyphenyl)azo][1,1'-biphenyl]-4-yl]azo]naphthalene-2,7-disulfonic acid disodium salt
CAS No.	6471-44-9
Molecular Formula	C44H28N10Na2O12S3
Molecular Weight	1030.91 g/mol
Synonyms	Direct Black 22 (disodium salt); C.I. 35435; Polyazo black dye intermediate; 5-[[2,4-Diamino-5-[(8-hydroxy-6-sulfo-2-naphthyl)azo]phenyl]azo]-4-hydroxy-3-[[4'-[(4-hydroxyphenyl)azo][1,1'-biphenyl]-4-yl]azo]-2,7-naphthalenedisulfonic acid disodium salt; Azo Black G Intermediate; Leather Black Dye Intermediate; Tetrakisazo Dye Intermediate
EINECS	Contact for details

Quality Control

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

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 container tightly sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Dark blue to black powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Sulfated Ash	≤ 20.0%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (in water)	Partially soluble, forms colloidal solution

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