Description

1,8'-Dihydroxy-7-[(2,4-Diaminophenyl)Azo][2,2'-Azobisnaphthalene]-3,6'-Disulfonic Acid Disodium Salt is a high-purity, water-soluble azo dye intermediate of significant industrial importance. Its complex molecular structure, featuring multiple azo and sulfonic acid groups, makes it a versatile precursor for synthesizing specialized dyes and pigments. This compound is primarily sought by manufacturers in the textile, leather, and specialty chemical industries for producing high-value colorants.

Application

• Primary Intermediate for Azo Dyes: A key building block in the synthesis of complex, high-performance azo dyes for textiles and leather.
• Specialty Pigment Manufacturing: Used in the production of pigments for inks, coatings, and plastics requiring specific color fastness and stability.
• Biological Staining Agent: Potential use as a precursor for histochemical stains and indicators in laboratory and diagnostic applications.
• Research & Development: Serves as a critical reagent in chemical research for developing new chromophores and functional materials.
• Paper Coloring: Can be utilized in the manufacture of dyes for specialty paper products.

Basic Information

Item	Detail
Product Name	1,8'-Dihydroxy-7-[(2,4-Diaminophenyl)Azo][2,2'-Azobisnaphthalene]-3,6'-Disulfonic Acid Disodium Salt
CAS No.	6492-57-5
Molecular Formula	C32H22N8O10S2 · 2Na
Molecular Weight	Contact for details
Synonyms	Acid Black 131; C.I. 15711; 1,8'-Dihydroxy-7-[(2,4-diaminophenyl)azo]-2,2'-azonaphthalene-3,6'-disulfonic acid disodium salt; 2,2'-Azobis[8-hydroxy-7-[(2,4-diaminophenyl)azo]-3,6-naphthalenedisulfonic acid] disodium salt; Azo Black; Leather Black; Disodium 1,8'-dihydroxy-7-[(2,4-diaminophenyl)azo]-2,2'-azonaphthalene-3,6'-disulphonate
EINECS	Contact for details

Quality Control

Our production of this azo dye intermediate adheres to strict quality management systems. Every batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise customer specifications. A Certificate of Analysis (COA) detailing batch-specific results is provided with each shipment to guarantee traceability and consistency for your manufacturing processes.

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 sealed to prevent absorption of atmospheric moisture, which can affect product quality and handling properties.

Specification

Item	Specification
Appearance	Dark brown to black powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
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.