Description

7-Amino-4-Hydroxy-8-[(3-Sulphophenyl)Azo]Naphthalene-2-Sulphonic Acid, Sodium Salt is a high-purity, water-soluble azo dye intermediate essential for synthesizing vibrant and stable colorants. This compound is valued for its consistent quality and reliable performance in demanding industrial processes. It is primarily utilized by manufacturers in the textile, ink, and specialty chemical sectors who require precise and reproducible color development.

Application

• Primary intermediate for the synthesis of acid dyes and direct dyes used in textile coloration.
• Key precursor in the production of pigments for inks, coatings, and plastics.
• Used in the manufacture of reactive dyes for cotton and other cellulosic fibers.
• Employed in research and development for creating novel functional dyes with specific optical properties.
• Acts as a chemical building block in the synthesis of specialty colorants for leather and paper.
• Potential use in the formulation of biological stains and diagnostic reagents.

Basic Information

Item	Information
Product Name	7-Amino-4-Hydroxy-8-[(3-Sulphophenyl)Azo]Naphthalene-2-Sulphonic Acid, Sodium Salt
CAS No.	93918-38-8
Molecular Formula	C₁₆H₁₁N₃O₇S₂•Na
Molecular Weight	460.39 g/mol
Synonyms	Acid Red 337; C.I. 17200; 7-Amino-4-hydroxy-2-naphthalenesulfonic acid-8-(3-sulfophenyl)azo, monosodium salt; 8-[(3-Sulfophenyl)azo]-7-amino-4-hydroxy-2-naphthalenesulfonic acid monosodium salt; Sodium 7-amino-4-hydroxy-8-[(3-sulfophenyl)azo]naphthalene-2-sulfonate; Azo dye intermediate 17200; 7-Amino-4-hydroxy-8-(3-sulfophenylazo)-2-naphthalenesulfonic acid sodium salt
EINECS	Contact for details

Quality Control

Our production of this dye intermediate adheres to strict quality management systems to ensure batch-to-batch consistency and high purity. Every lot is tested against rigorous in-house specifications, which typically include assay, identification, and impurity profile analysis. A Certificate of Analysis (COA) detailing all test results is provided with each shipment to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from incompatible materials. Due to its light-sensitive nature, prolonged exposure to direct light should be avoided.

Specification

Item	Specification
Appearance	Dark red to brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Water Content	≤ 5.0%
Sulfated Ash	≤ 20.0%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (in Water)	Clear solution

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