Description

3-Hydroxy-4-[(4-Sulphonaphthyl)Azo]Naphthalene-2,7-Disulphonic Acid is a high-purity, water-soluble azo dye intermediate characterized by its multi-sulfonic acid functional groups. This compound is essential for synthesizing vibrant and stable acid dyes and pigments, offering excellent color fastness and solubility properties. It is primarily required by manufacturers in the textile, leather, and specialty ink industries for producing high-quality coloring agents. The product is supplied with full traceability and consistent batch-to-batch quality to ensure reliable performance in demanding industrial applications.

Application

• Primary Intermediate for Acid Dyes: Key starting material for the synthesis of acid dyes used in wool, silk, and nylon textile dyeing and printing.
• Leather Coloring Agent: Used in the formulation of dyes for coloring leather goods, providing deep, uniform shades.
• Paper and Specialty Ink Production: Employed in the manufacture of colorants for high-quality paper and certain types of inks.
• Lakes and Pigments: Serves as a precursor for creating insoluble lake pigments used in paints and coatings.
• Biological Staining (Research Grade): High-purity grades can be utilized as a staining agent in histological and cytological research.
• Chemical Synthesis: Acts as a versatile intermediate for further chemical modifications in organic synthesis due to its reactive azo and sulfonic acid groups.

Basic Information

Product Name	3-Hydroxy-4-[(4-Sulphonaphthyl)Azo]Naphthalene-2,7-Disulphonic Acid
CAS No.	642-59-1
Molecular Formula	C₂₀H₁₂N₂O₉S₃
Molecular Weight	520.51 g/mol
Synonyms	Acid Orange 20; C.I. 14600; 2,7-Naphthalenedisulfonic acid, 3-hydroxy-4-[(4-sulfo-1-naphthalenyl)azo]-; 3-Hydroxy-4-(2-(4-sulfo-1-naphthyl)diazenyl)naphthalene-2,7-disulfonic acid; 4-[(4-Sulfo-1-naphthyl)azo]-3-hydroxy-2,7-naphthalenedisulfonic acid; Brilliant Orange G; Orange G; Wool Orange G
EINECS	211-403-8

Quality Control

Every batch of 3-Hydroxy-4-[(4-Sulphonaphthyl)Azo]Naphthalene-2,7-Disulphonic Acid is manufactured under a strict quality management system. Our products undergo rigorous quality testing, including HPLC for purity and identity confirmation, to ensure compliance with industry standards and customer specifications. Certificates of Analysis (COA) detailing purity, impurity profile, and physical data are available upon request to support your quality assurance and regulatory needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Keep away from strong acids and organic solvents. The container must be kept tightly sealed to protect the contents from atmospheric moisture.

Specification

Item	Specification
Appearance	Orange to reddish-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Water Content	≤ 5.0%
Sulfated Ash	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (in Water)	Clear, orange solution

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