Description

4-Hydroxy-7-[[[[5-hydroxy-6-[(2-methyl-4-sulfophenyl)azo]-7-sulfo-2-naphthalenyl]amino]carbonyl]amino]-3-[(6-sulfo-2-naphthalenyl)azo]-2-naphthalenesulfonic acid tetrasodium salt is a high-purity, water-soluble azo dye intermediate of significant commercial importance. Its complex poly-sulfonated structure provides excellent substantivity and chromophoric properties, making it a critical precursor for the synthesis of high-value dyes and pigments. This compound is essential for manufacturers in the textile, ink, and specialty coatings industries seeking to produce vibrant, wash-fast colors.

Application

• Primary Intermediate for Reactive Dyes: Key building block in the synthesis of high-performance reactive dyes for cotton, wool, and nylon fibers.
• Textile Colorant Production: Used to manufacture dyes offering excellent brightness, color strength, and wet fastness properties.
• Inkjet Ink Formulations: Serves as a precursor for pigments used in high-quality digital printing inks.
• Specialty Pigment Synthesis: Employed in creating complex organic pigments for plastics, paints, and coatings.
• Laboratory & Research: Used as a standard or reagent in chromatographic analysis and dye chemistry research.
• Paper Coloring: Intermediate for dyes applied in specialty paper and packaging products.
• Leather Dyeing: Used in the production of dyes for the leather tanning and finishing industry.

Basic Information

Item	Detail
Product Name	4-Hydroxy-7-[[[[5-hydroxy-6-[(2-methyl-4-sulfophenyl)azo]-7-sulfo-2-naphthalenyl]amino]carbonyl]amino]-3-[(6-sulfo-2-naphthalenyl)azo]-2-naphthalenesulfonic acid tetrasodium salt
CAS No.	69121-23-9
Molecular Formula	C38H22N6O16S4 · 4Na
Molecular Weight	Contact for details
Synonyms	Reactive Black 5 Tetrasodium Salt; Remazol Black B; C.I. Reactive Black 5; Tetrasodium 4-amino-5-hydroxy-3,6-bis((4-sulfonaphthalen-1-yl)diazenyl)naphthalene-2,7-disulfonate (related form); 4-Amino-5-hydroxy-6-[2-(4-sulfophenyl)diazenyl]naphthalene-2,7-disulfonic acid derivative; Azo dye intermediate 69121-23-9; Poly-sulfonated azo dye precursor
EINECS	Contact for details

Quality Control

Our production of 4-Hydroxy-7-[[[[5-hydroxy-6-[(2-methyl-4-sulfophenyl)azo]-7-sulfo-2-naphthalenyl]amino]carbonyl]amino]-3-[(6-sulfo-2-naphthalenyl)azo]-2-naphthalenesulfonic acid tetrasodium salt adheres to stringent quality management systems. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure consistency and compliance with customer specifications. Certificates of Analysis (COA) documenting key parameters are available upon request to support your quality assurance protocols.

Storage

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

Specification

Item	Specification
Appearance	Dark blue to black powder or granules
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 90% (Typical 92-95%)
Moisture Content	≤ 5.0%
Water Solubility	Freely soluble
Heavy Metals (as Pb)	≤ 20 ppm
pH (1% Solution)	6.0 - 8.0

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