Description

Disodium 4-[[2,4-Dihydroxy-3-[(4-Sulphonatophenyl)Azo]Phenyl]Azo]Naphthalene-1-Sulphonate is a high-purity, water-soluble azo dye intermediate of significant commercial importance. Its primary value lies in its role as a key precursor for synthesizing vibrant and stable acid dyes and reactive dyes. This compound is essential for manufacturers in the textile, leather, and specialty ink industries seeking to produce high-quality colorants with excellent fastness properties. Consistent quality and reliable supply of this intermediate are critical for maintaining color consistency and production efficiency in downstream applications.

Application

• Primary Intermediate for Acid Dyes: A crucial building block in the synthesis of acid dyes used for coloring nylon, silk, wool, and modified acrylic fibers.
• Synthesis of Reactive Dyes: Used in the production of reactive dyes for cotton and other cellulosic fibers, providing strong covalent bonds for excellent wash-fastness.
• Leather Dyeing: Employed in the manufacture of dyes for leather finishing, offering deep, uniform shades.
• Paper Coloring: Serves as an intermediate for dyes used in specialty paper and paperboard products.
• Ink Formulation: Used in the production of colorants for inks, including some jet printing inks.
• Biological Staining: Potential use as an intermediate for histological stains in laboratory settings.
• Research & Development: A valuable chemical for R&D laboratories focusing on novel dye synthesis and color chemistry.

Basic Information

Product Name	Disodium 4-[[2,4-Dihydroxy-3-[(4-Sulphonatophenyl)Azo]Phenyl]Azo]Naphthalene-1-Sulphonate
CAS No.	5850-15-7
Molecular Formula	C22H14N4Na2O9S2
Molecular Weight	604.47 g/mol
Synonyms	Acid Orange 20 (disodium salt); C.I. 14600; 4-[[2,4-Dihydroxy-3-[(4-sulfophenyl)azo]phenyl]azo]-1-naphthalenesulfonic acid disodium salt; 1-Naphthalenesulfonic acid, 4-[[2,4-dihydroxy-3-[(4-sulfophenyl)azo]phenyl]azo]-, disodium salt; Disodium 4-[(2,4-dihydroxy-3-[(4-sulfonatophenyl)diazenyl]phenyl)diazenyl]naphthalene-1-sulfonate; Tropaeolin OO; Orange II (disodium salt); Dye Intermediate 5850-15-7
EINECS	Contact for details

Quality Control

Our Disodium 4-[[2,4-Dihydroxy-3-[(4-Sulphonatophenyl)Azo]Phenyl]Azo]Naphthalene-1-Sulphonate is manufactured under a stringent quality management system. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise specifications for dye intermediate applications. Certificates of Analysis (COA) detailing purity, impurity profile, and physical characteristics are provided with each shipment to guarantee traceability and consistency for your production processes.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, 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, which can affect handling and performance.

Specification

Item	Specification
Appearance	Orange to reddish-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Sulfated Ash	≤ 30.0%
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.