Description

Tetrasodium 5-[[2,4-dihydroxy-5-[[4-[(4-nitro-2-sulphonatophenyl)amino]phenyl]azo]phenyl]azo]-4-hydroxy-3-[[4-[(4-nitro-2-sulphonatophenyl)amino]phenyl]azo]naphthalene-2,7-disulphonate is a high-purity, water-soluble azo dye intermediate of significant industrial importance. This compound is valued for its ability to impart strong, stable coloration and is a critical precursor in the synthesis of complex dyes and pigments. It is primarily sought after by manufacturers in the textile, ink, and specialty chemical industries for producing high-performance colorants.

Application

• Primary intermediate for the synthesis of high-grade, complex azo dyes and pigments.
• Key component in the manufacturing of dyes for textile fibers, including cotton, wool, and nylon.
• Used in the production of colorants for inks, including those for packaging and security printing.
• Precursor for specialty dyes used in leather and paper coloration.
• Potential use in the formulation of functional dyes for optical applications and sensors.
• Research and development of novel colorants in academic and industrial laboratories.

Basic Information

Product Name	Tetrasodium 5-[[2,4-dihydroxy-5-[[4-[(4-nitro-2-sulphonatophenyl)amino]phenyl]azo]phenyl]azo]-4-hydroxy-3-[[4-[(4-nitro-2-sulphonatophenyl)amino]phenyl]azo]naphthalene-2,7-disulphonate
CAS No.	70210-34-3
Molecular Formula	C46H28N10Na4O22S4
Molecular Weight	Approx. 1292.9 g/mol
Synonyms	Direct Black 22, Tetrasodium Salt; C.I. 35435; Direct Black 22 (tetrasodium salt); 5-[[2,4-Dihydroxy-5-[[4-[(4-nitro-2-sulfonatophenyl)amino]phenyl]azo]phenyl]azo]-4-hydroxy-3-[[4-[(4-nitro-2-sulfonatophenyl)amino]phenyl]azo]naphthalene-2,7-disulfonic acid, tetrasodium salt; Direct Black 22Na4; Azo Dye Intermediate 70210-34-3
EINECS	Contact for details

Quality Control

Our production of this dye intermediate adheres to stringent quality protocols to ensure batch-to-batch consistency and high purity. Every lot undergoes comprehensive analysis, including HPLC for assay and impurity profiling, to meet exacting customer specifications. A Certificate of Analysis (COA) detailing identity, purity, and relevant physical parameters is provided with each shipment to support your quality assurance and regulatory compliance needs.

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 handling properties.

Specification

Item	Specification
Appearance	Dark brown to black powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Water Content	≤ 5.0%
Sulfated Ash	Contact for details
Solubility (in Water)	Freely soluble

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