Description

6-Hydroxy-5-[(4-Sulphophenyl)Azo]Naphthalene-2-Sulphonic Acid is a synthetic azo dye intermediate of significant commercial importance. Its core value lies in its ability to impart vibrant and stable color properties, making it a critical precursor in the production of high-performance dyes and pigments. This compound is essential for manufacturers in the textile, ink, and specialty chemical industries seeking reliable and consistent raw materials for their colorant formulations.

Application

• Primary Intermediate for Azo Dyes: Serves as a key building block in the synthesis of acid dyes and direct dyes used for coloring wool, silk, nylon, and paper.
• Textile Industry: Used in the manufacturing of dyes for textile fibers, providing good wash and light fastness properties.
• Ink Production: Employed as a colorant intermediate in the formulation of printing inks for packaging and publications.
• Leather Dyeing: Acts as an intermediate for dyes used in the leather tanning and finishing industry.
• Food Colorant Precursor (Regulated Grades): Certain purified grades may be used in the synthesis of food colorants, subject to strict regional regulatory compliance (e.g., FDA, EFSA).
• Laboratory Reagent: Used in research and development as a standard or reagent for analytical chemistry and dye synthesis studies.
• Specialty Pigments: A precursor for lake pigments and other specialty colorants used in plastics and coatings.

Basic Information

Product Name	6-Hydroxy-5-[(4-Sulphophenyl)Azo]Naphthalene-2-Sulphonic Acid
CAS No.	5859-11-0
Molecular Formula	C₁₆H₁₁N₂O₇S₂
Molecular Weight	407.40 g/mol
Synonyms	Acid Orange 20; C.I. 14600; 6-Hydroxy-5-[(4-sulfophenyl)azo]-2-naphthalenesulfonic acid; 2-Naphthalenesulfonic acid, 6-hydroxy-5-[(4-sulfophenyl)azo]-; Benzenesulfonic acid, 4-[(6-hydroxy-5-sulfo-2-naphthalenyl)azo]-; 5-[(4-Sulfophenyl)azo]-6-hydroxy-2-naphthalenesulfonic acid; Orange II; Tropaeolin OO
EINECS	227-502-8

Quality Control

Our 6-Hydroxy-5-[(4-Sulphophenyl)Azo]Naphthalene-2-Sulphonic Acid is manufactured under a stringent quality management system. Every batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, color strength, and impurity profiles. Certificates of Analysis (COA) detailing results for assay, heavy metals, and related substances 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 tightly sealed after opening to prevent absorption of atmospheric moisture, which can affect product stability and performance.

Specification

Item	Specification
Appearance	Orange to reddish-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	≤ 1.0%
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.