Description

Disodium 6-Hydroxy-5-[(3-Sulphonatophenyl)Azo]Naphthalene-2-Sulphonate is a high-purity, water-soluble azo dye intermediate. This compound is valued for its role in synthesizing vibrant and stable colorants, particularly in the production of acid dyes and food colorants. It is essential for manufacturers in the textile, food, and specialty chemical industries seeking reliable, consistent quality for their formulations.

Application

• Primary Intermediate for Acid Dyes: A key building block in the synthesis of acid dyes used for coloring nylon, wool, silk, and other polyamide fibers.
• Food Colorant Production: Used in the manufacture of certain synthetic food dyes, where it contributes to bright, stable hues.
• Paper and Leather Dyeing: Employed in the coloration of specialty papers and leather goods.
• Ink Formulation: Serves as a colorant component in the production of inks for various printing applications.
• Laboratory Reagent: Used as a standard or reagent in analytical chemistry and research laboratories.
• Biological Staining: Potential use as a histological stain in microscopy due to its chromophoric properties.

Basic Information

Product Name	Disodium 6-Hydroxy-5-[(3-Sulphonatophenyl)Azo]Naphthalene-2-Sulphonate
CAS No.	2347-72-0
Molecular Formula	C₁₆H₁₀N₂Na₂O₈S₂
Molecular Weight	468.37 g/mol
Synonyms	Acid Orange 20; C.I. 14600; Disodium 6-hydroxy-5-[(3-sulfophenyl)azo]-2-naphthalenesulfonate; 6-Hydroxy-5-[(3-sulfophenyl)azo]-2-naphthalenesulfonic acid disodium salt; Orange II sodium salt; Tropaeolin OO; C.I. Acid Orange 20; Food Orange 2
EINECS	219-057-8

Quality Control

Our Disodium 6-Hydroxy-5-[(3-Sulphonatophenyl)Azo]Naphthalene-2-Sulphonate is manufactured under strict quality management systems. Each 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) documenting purity, heavy metal content, and other critical parameters are available for every shipment to guarantee traceability and compliance.

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). 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.

Specification

Item	Specification
Appearance	Orange to red-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 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.