Description

Disodium 4,4'-[(4,6-Dihydroxy-1,3-Phenylene)Bis(Azo)]Bisnaphthalene-1-Sulphonate is a high-purity, water-soluble azo dye intermediate of significant industrial importance. This compound is valued for its ability to impart vivid and stable coloration, making it a critical precursor in the synthesis of specialized dyes and pigments. It is primarily sought by manufacturers in the textile, ink, and specialty chemical industries for producing high-performance colorants.

Application

• Primary Intermediate for Azo Dyes: A key building block in the synthesis of acid dyes, direct dyes, and reactive dyes used for coloring nylon, wool, silk, and paper.
• Textile Industry: Used in the production of dyes for textile fibers, offering good wash and light fastness properties.
• Ink Manufacturing: Serves as a colorant component in the formulation of inks for various printing applications.
• Biological Staining: Potential use as a staining agent in histology and microscopy due to its specific chromogenic properties.
• Research & Development: Employed in chemical research as a model compound for studying azo chemistry and developing new chromophores.
• Specialty Pigments: Can be used in the development of lakes and pigments for plastics and coatings.

Basic Information

Product Name	Disodium 4,4'-[(4,6-Dihydroxy-1,3-Phenylene)Bis(Azo)]Bisnaphthalene-1-Sulphonate
CAS No.	73309-47-4
Molecular Formula	C32H18N4Na2O10S2
Molecular Weight	744.61 g/mol
Synonyms	Disodium 4,4'-[(4,6-dihydroxy-1,3-phenylene)bis(azo)]bis(naphthalene-1-sulfonate); 4,4'-[(4,6-Dihydroxy-1,3-phenylene)bis(azo)]di(1-naphthalenesulfonic acid) disodium salt; Azo Dye Intermediate 73309-47-4; 1-Naphthalenesulfonic acid, 4,4'-[(4,6-dihydroxy-1,3-phenylene)bis(azo)]bis-, disodium salt; C.I. 29050; Direct Red 81 (related dye class); Bis-azo dye intermediate; Acid Dye Intermediate
EINECS	Contact for details

Quality Control

Our Disodium 4,4'-[(4,6-Dihydroxy-1,3-Phenylene)Bis(Azo)]Bisnaphthalene-1-Sulphonate is manufactured under strict quality management systems. Every batch undergoes rigorous analytical testing to ensure consistent purity, identity, and performance. Certificates of Analysis (COA) detailing key specifications such as assay, impurity profile, and physical properties are provided and available upon request 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 room temperature (15-25°C). This material is hygroscopic (moisture-sensitive); therefore, the container must be kept tightly sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Reddish-brown to dark brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	≤ 20.0%
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.