Description

5-[[4'-[[8-[[6-[(2,4-Diaminophenyl)azo]-1-hydroxy-3-sodiosulfo-2-naphthalenyl]azo]-1-hydroxy-3,6-bis(sodiosulfo)-2-naphthalenyl]azo][1,1'-biphenyl]-4-yl]azo]-2-hydroxybenzoic acid sodium salt is a high-purity, complex azo dye intermediate known for its excellent chromophore properties. This compound is critical for synthesizing high-performance dyes and pigments that require superior color strength, lightfastness, and washfastness. It is primarily sought after by manufacturers in the textile, leather, and specialty ink industries for producing high-value, durable colorants.

Application

• Textile Dyeing: A key intermediate for producing high-grade, washfast, and lightfast direct and reactive dyes for cotton, wool, and synthetic fibers.
• Leather Coloring: Used in the synthesis of pigments and dyes for high-quality leather finishing, providing deep, vibrant colors.
• Specialty Inks: Serves as a precursor for manufacturing pigments used in high-performance inks for packaging, security printing, and digital applications.
• Paper Dyeing: Employed in the production of dyes for coloring high-grade paper and paperboard.
• Research & Development: Used as a standard or building block in chemical research for developing novel chromophores and functional dyes.
• Functional Dyes: Potential applications in the synthesis of dyes for non-textile uses, such as in optical data storage or as biological stains.

Basic Information

Item	Details
Product Name	5-[[4'-[[8-[[6-[(2,4-Diaminophenyl)azo]-1-hydroxy-3-sodiosulfo-2-naphthalenyl]azo]-1-hydroxy-3,6-bis(sodiosulfo)-2-naphthalenyl]azo][1,1'-biphenyl]-4-yl]azo]-2-hydroxybenzoic acid sodium salt
CAS No.	6428-42-8
Molecular Formula	C53H34N10Na4O16S4
Molecular Weight	~1293.1 g/mol
Synonyms	Direct Black 19 (sodium salt); C.I. 35255; Direct Black 19, Sodium Salt; 2-Hydroxy-5-[[4'-[[8-[[6-[(2,4-diaminophenyl)azo]-1-hydroxy-3-sulfo-2-naphthyl]azo]-1-hydroxy-3,6-disulfo-2-naphthyl]azo][1,1'-biphenyl]-4-yl]azo]benzoic acid sodium salt; Benzoic acid, 2-hydroxy-5-[[4'-[[8-[[6-[(2,4-diaminophenyl)azo]-1-hydroxy-3-sulfo-2-naphthalenyl]azo]-1-hydroxy-3,6-disulfo-2-naphthalenyl]azo][1,1'-biphenyl]-4-yl]azo]-, sodium salt (1:4)
EINECS	Contact for details

Quality Control

Our production of this azo dye intermediate adheres to strict quality management systems to ensure batch-to-batch consistency and purity. Each lot undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation. A Certificate of Analysis (COA) detailing assay, impurity profile, and physical specifications is provided with every shipment to guarantee compliance with your technical requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Due to its hygroscopic nature, the container must be kept tightly sealed to prevent moisture absorption, which can affect product stability and performance.

Specification

Item	Specification
Appearance	Dark brown to black powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Water Solubility	Freely soluble
Heavy Metals (as Pb)	≤ 20 ppm
Residue on Ignition	≤ 1.0%

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