Description

3-[[4-[[4-[(1-Hydroxy-6-phenylamino-3-sodiosulfo-2-naphthalenyl)azo]-6-sodiosulfo-1-naphthalenyl]azo]-1-naphthalenyl]azo]naphthalene-1,5-disulfonic acid disodium salt is a high-purity, water-soluble azo dye intermediate of significant commercial importance. This compound is valued for its ability to impart a strong, stable color and is a critical precursor in the synthesis of specialized dyes and pigments. It is primarily required by manufacturers in the textile, ink, and specialty chemical industries for producing high-performance colorants.

Application

• Primary Intermediate for Dye Synthesis: A key building block for manufacturing complex azo dyes, particularly for textiles like cotton and nylon.
• Textile Dyeing and Printing: Used in the formulation of dyes for achieving specific, vibrant shades with good wash and light fastness.
• Inkjet and Printing Inks: Serves as a colorant component in the production of high-quality inks for digital and industrial printing.
• Paper Coloring: Employed in the dyeing of specialty papers and paper products.
• Leather Dyeing: Used in formulations for dyeing leather goods.
• Research & Development: Utilized in chemical R&D for developing new chromophores and functional dyes.
• Biological Staining: Potential application as a stain or marker in histological studies due to its chromophoric properties.

Basic Information

Item	Details
Product Name	3-[[4-[[4-[(1-Hydroxy-6-phenylamino-3-sodiosulfo-2-naphthalenyl)azo]-6-sodiosulfo-1-naphthalenyl]azo]-1-naphthalenyl]azo]naphthalene-1,5-disulfonic acid disodium salt
CAS No.	6548-32-9
Molecular Formula	C46H28N8Na4O14S4
Molecular Weight	1157.0 g/mol (approx.)
Synonyms	Direct Black 22 (Parent Dye); C.I. 35435; Pontamine Black E; Azo Black; 1,5-Naphthalenedisulfonic acid, 3-[[4-[[4-[(1-hydroxy-6-(phenylamino)-3-sulfo-2-naphthalenyl)azo]-6-sulfo-1-naphthalenyl]azo]-1-naphthalenyl]azo]-, tetrasodium salt; Tetrasodium 3-[[4-[[4-[(1-hydroxy-6-anilino-3-sulfonato-2-naphthyl)azo]-6-sulfonato-1-naphthyl]azo]-1-naphthyl]azo]naphthalene-1,5-disulfonate; Direct Black EW; Benzo Black E
EINECS	229-476-2

Quality Control

Our production of this dye intermediate adheres to strict quality control protocols to ensure batch-to-batch consistency and high purity. Quality is verified through advanced analytical techniques including HPLC and spectrophotometry. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with each shipment to support your quality assurance processes.

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 performance and handling.

Specification

Item	Specification
Appearance	Dark blue to black powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Water Solubility	Freely soluble
Heavy Metals (as Pb)	≤ 20 ppm
Sulfated Ash	≤ 30.0%

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