Description

Disodium 3-Hydroxy-4-(Phenylazo)Naphthalene-2,7-Disulphonate 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 a range of vibrant and stable dyes and pigments. This compound is essential for manufacturers in the textile, ink, and specialty chemical industries seeking to produce high-quality colorants. Its consistent performance and purity make it a reliable choice for demanding industrial applications.

Application

• Primary Dye Intermediate: Serves as a crucial building block for the synthesis of acid dyes, direct dyes, and reactive dyes used in textile coloring.
• Textile Industry: Used in the dyeing and printing of natural fibers like wool, silk, and nylon, as well as some synthetic fabrics.
• Ink Manufacturing: Employed in the production of inks for writing, printing, and packaging, contributing to color strength and stability.
• Pigment Production: Acts as a starting material for creating lake pigments and other insoluble colorants used in paints and coatings.
• Laboratory & Research: Utilized as a standard or reagent in chemical research focused on azo compound synthesis and dye chemistry.
• Specialty Chemicals: Finds application in the formulation of specialized colorants for paper, leather, and other industrial materials.

Basic Information

Product Name	Disodium 3-Hydroxy-4-(Phenylazo)Naphthalene-2,7-Disulphonate
CAS No.	5859-00-7
Molecular Formula	C₁₆H₁₀N₂Na₂O₈S₂
Molecular Weight	484.37 g/mol
Synonyms	Acid Orange 20 (C.I. 14630); 3-Hydroxy-4-(phenylazo)naphthalene-2,7-disulfonic acid disodium salt; Disodium 4-(phenylazo)-3-hydroxy-2,7-naphthalenedisulfonate; Naphthalene Orange G; Orange G; Tropaeolin O; Wool Orange G; 2,7-Naphthalenedisulfonic acid, 3-hydroxy-4-(phenylazo)-, disodium salt
EINECS	227-500-8

Quality Control

Our Disodium 3-Hydroxy-4-(Phenylazo)Naphthalene-2,7-Disulphonate is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, color strength, and chemical composition. Certificates of Analysis (COA) documenting key parameters are 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). 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 reddish-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
Related Substances (HPLC)	Total impurities ≤ 3.0%

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