Description

Sodium 5-[(2-Hydroxynaphthyl)Azo]Naphthalenesulphonate is a high-purity azo dye intermediate and analytical reagent. This compound is valued for its strong chromophoric properties and its role as a key precursor in the synthesis of specialized dyes and pigments. It is essential for manufacturers and R&D laboratories in the colorant, textile, and analytical chemistry sectors seeking consistent quality and reliable supply.

Application

• Primary intermediate in the synthesis of azo dyes and pigments for textiles, inks, and plastics.
• Key component in the production of acid dyes used for coloring nylon, silk, and wool.
• Used as a colorimetric reagent and indicator in analytical chemistry and laboratory testing.
• Employed in the manufacturing of specialty colorants for paper, leather, and food packaging (where compliant).
• Research and development of novel functional dyes for non-textile applications, including sensors.
• Potential use as a staining agent in biological and histological studies.

Basic Information

Product Name	Sodium 5-[(2-Hydroxynaphthyl)Azo]Naphthalenesulphonate
CAS No.	5850-93-1
Molecular Formula	C₂₀H₁₃N₂NaO₄S
Molecular Weight	400.38 g/mol
Synonyms	5-[(2-Hydroxy-1-naphthyl)azo]naphthalene-2-sulphonic acid sodium salt; C.I. 15620; Acid Orange 20; Sodium 5-[(2-hydroxy-1-naphthyl)azo]-2-naphthalenesulfonate; 1-Naphthalenesulfonic acid, 5-[(2-hydroxy-1-naphthyl)azo]-, sodium salt; Orange II sodium salt; Tropaeolin OO; Wool Orange A
EINECS	227-475-5

Quality Control

Our Sodium 5-[(2-Hydroxynaphthyl)Azo]Naphthalenesulphonate is manufactured under a strict quality management system. Each batch undergoes comprehensive analytical testing, including assay, identification, and impurity profiling, to ensure it meets precise specifications. A Certificate of Analysis (COA) detailing all test results is provided with 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 a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after opening to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Orange to red-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Heavy Metals (as Pb)	≤ 20 ppm
Water Solubility	Freely soluble

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