Description

Trisodium 5-[(7-Amino-1-Hydroxy-3-Sulphonato-2-Naphthyl)Azo]-8-[[4-(Phenylazo)-7-Sulphonatonaphthyl]Azo]Naphthalene-2-Sulphonate is a high-purity, water-soluble azo dye intermediate essential for producing vivid and durable colorants. Its complex, multi-sulphonated structure provides excellent substantivity and chromophore stability, making it a critical component for demanding applications. This compound is primarily required by manufacturers in the textile, ink, and specialty chemical industries seeking to formulate high-performance dyes and pigments.

Application

• Primary Intermediate for Reactive Dyes: Key building block for synthesizing high-grade reactive dyes used in cotton and cellulose fiber dyeing.
• Textile Printing Inks: Used in the formulation of inks for digital and screen printing on textiles, offering excellent color yield and wash-fastness.
• Specialty Pigment Manufacturing: Serves as a precursor for creating complex organic pigments with enhanced thermal and light stability.
• Leather Dyeing: Employed in the production of dyes for leather finishing, providing deep, uniform coloration.
• Paper Coloration: Used in the manufacture of dyes for high-quality paper and packaging materials.
• Research & Development: A valuable chemical for R&D laboratories focusing on novel chromophores and dye chemistry.

Basic Information

Product Name	Trisodium 5-[(7-Amino-1-Hydroxy-3-Sulphonato-2-Naphthyl)Azo]-8-[[4-(Phenylazo)-7-Sulphonatonaphthyl]Azo]Naphthalene-2-Sulphonate
CAS No.	6406-87-7
Molecular Formula	C36H21N6Na3O13S3
Molecular Weight	918.80 g/mol
Synonyms	Direct Black 22 (sodium salt); C.I. 35435; Trisodium 8-[[4-(phenylazo)-7-sulphonato-1-naphthyl]azo]-5-[(7-amino-1-hydroxy-3-sulphonato-2-naphthyl)azo]naphthalene-2-sulphonate; 5-[(7-Amino-1-hydroxy-3-sulphonato-2-naphthyl)azo]-8-[[4-(phenylazo)-7-sulphonato-1-naphthyl]azo]naphthalene-2-sulphonic acid trisodium salt; Direct Black 22Na; Azo Black Dye Intermediate; C.I. Direct Black 22
EINECS	229-077-6

Quality Control

Our production of this azo dye intermediate adheres to strict quality management systems to ensure batch-to-batch consistency and purity. Every lot is tested against comprehensive specifications, including identity confirmation by FT-IR, purity assay by HPLC, and control of key impurities. A detailed Certificate of Analysis (COA) is provided with each shipment, documenting all relevant parameters to support your quality assurance protocols.

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 nature, the container must be kept tightly sealed after each use to prevent moisture absorption, which can affect product performance and handling.

Specification

Item	Specification
Appearance	Dark brown to black powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 95.0%
Moisture Content (KF)	≤ 5.0%
Sulphated Ash	≤ 20.0%
Water Solubility	Freely soluble
Heavy Metals (as Pb)	≤ 20 ppm

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