Description

Benzenedicarboxylic Acid, 4-(7-Amino-1-Hydroxy-3-Sulfo-2-Naphthalenyl)Azo-1-Naphthalenylazo-, Ammonium Salt is a high-purity, water-soluble azo dye intermediate of significant commercial importance. Its complex polyazo structure, featuring multiple sulfonate and ammonium groups, makes it a critical precursor for synthesizing high-performance dyes and pigments. This compound is essential for manufacturers in the textile, ink, and specialty coatings industries seeking to produce vibrant, colorfast, and environmentally compliant colorants.

Application

• Primary intermediate for the synthesis of azo dyes and pigments used in textile dyeing and printing.
• Key component in the production of high-performance inks for digital, packaging, and security printing applications.
• Precursor for specialty colorants used in industrial coatings, plastics, and leather finishing.
• Used in research and development of novel functional dyes for optical data storage, sensors, and biomedical imaging.
• Raw material for manufacturing lake pigments suitable for food contact materials and cosmetics, subject to appropriate purity grades.
• Intermediate in the synthesis of reactive dyes for cellulose fibers like cotton, offering excellent wash-fastness.

Basic Information

Product Name	Benzenedicarboxylic Acid, 4-(7-Amino-1-Hydroxy-3-Sulfo-2-Naphthalenyl)Azo-1-Naphthalenylazo-, Ammonium Salt
CAS No.	139432-69-2
Molecular Formula	C27H21N5O8S · xNH3
Molecular Weight	Contact for details
Synonyms	4-[(7-Amino-1-hydroxy-3-sulfo-2-naphthyl)azo]-1-naphthylazobenzene-1,4'-dicarboxylic acid ammonium salt; Azo dye intermediate 139432-69-2; Polyazo dye intermediate; Ammonium salt of a disazo dicarboxylic acid; C.I. Azoic Diazo Component (related); Benzenedicarboxylic acid, azo derivative ammonium salt; 1,4-Benzenedicarboxylic acid, 4-[(7-amino-1-hydroxy-3-sulfo-2-naphthalenyl)azo]-1-naphthalenylazo-, ammonium salt (1:?); Tetrasodium salt variant may exist.
EINECS	Contact for details

Quality Control

Our production of this advanced dye intermediate adheres to strict quality management systems, ensuring batch-to-batch consistency and reliability. Quality is verified through comprehensive analytical methods including HPLC for purity, spectrophotometry for strength, and titration for functional group analysis. A Certificate of Analysis (COA) detailing assay, impurity profile, physical characteristics, and heavy metal content is provided with every shipment 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). This material is hygroscopic (moisture-sensitive); keep the container tightly sealed when not in use to prevent absorption of atmospheric moisture. Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	Dark brown to black powder or crystalline solid
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 95.0% (typical 97-99%)
Moisture Content (KF)	≤ 5.0%
Ash Content	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm
Water Solubility	Freely soluble

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