Description

7-Amino-4-Hydroxy-3-[(2-Sulphophenyl)Azo]Naphthalene-2-Sulphonic Acid is a high-purity, water-soluble azo dye intermediate of significant commercial importance. Its value lies in its role as a key precursor for synthesizing a range of vibrant and stable acid dyes and pigments. This compound is essential for manufacturers in the textile, leather, and specialty ink industries seeking to produce high-quality colorants with excellent fastness properties. We supply this critical intermediate with a focus on consistent quality and reliable global supply chains.

Application

• Primary Intermediate for Acid Dyes: Serves as the core building block for manufacturing a wide spectrum of red, violet, and blue acid dyes used in nylon, wool, and silk.
• Textile Dyeing: Used in the production of dyes for the coloration of natural and synthetic polyamide fibers, ensuring good wash and light fastness.
• Leather Finishing: Employed in synthesizing dyes for high-quality leather goods, providing deep, uniform shades.
• Paper Coloring: A precursor for dyes used in specialty paper products and coatings.
• Ink Formulation: Used in the manufacture of pigments for inks, including those for packaging and security printing applications.
• Research & Development: Serves as a standard and starting material in chemical R&D for novel dye and functional material synthesis.

Basic Information

Product Name	7-Amino-4-Hydroxy-3-[(2-Sulphophenyl)Azo]Naphthalene-2-Sulphonic Acid
CAS No.	22136-09-0
Molecular Formula	C₁₆H₁₂N₄O₇S₂
Molecular Weight	428.42 g/mol
Synonyms	Acid Red 299; 7-Amino-4-hydroxy-3-[(2-sulfophenyl)azo]naphthalene-2-sulfonic acid; 2-Naphthalenesulfonic acid, 7-amino-4-hydroxy-3-[(2-sulfophenyl)azo]-; C.I. 18134; Azo Rubine S; Azo Rubine SA; Naphthol AS-SR; 2-Amino-8-hydroxy-7-[(2-sulfophenyl)azo]-3,6-naphthalenedisulfonic acid (tautomeric form)
EINECS	244-791-6

Quality Control

Our production of 7-Amino-4-Hydroxy-3-[(2-Sulphophenyl)Azo]Naphthalene-2-Sulphonic Acid adheres to stringent quality management protocols. Every batch is analyzed to ensure it meets precise chemical and physical specifications, with purity typically exceeding 95% (HPLC). We provide comprehensive Certificates of Analysis (COA) that detail key parameters such as assay, impurity profile, and solubility. Our quality system is designed to support customers requiring consistent material for GMP-compliant manufacturing processes.

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); ensure the container is kept sealed to prevent absorption of atmospheric moisture. Keep away from strong acids and incompatible materials such as strong oxidizing agents.

Specification

Item	Specification
Appearance	Dark red to brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	≤ 1.0%
Solubility (Water)	Soluble, clear solution
Heavy Metals (as Pb)	≤ 20 ppm

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