Description

7-Hydroxy-8-[(4-Sulphonaphthyl)Azo]Naphthalene-1,3-Disulphonic Acid is a high-purity, water-soluble azo dye intermediate characterized by its distinct chemical structure. This compound is essential for synthesizing a range of vibrant and stable dyes and pigments, offering manufacturers a reliable building block for colorant production. It is primarily utilized by the textile, ink, and specialty chemical industries seeking consistent quality and performance in their formulations.

Application

• Primary Intermediate for Azo Dyes: Serves as a key precursor in the synthesis of acid dyes and direct dyes, particularly for coloring wool, silk, and nylon.
• Textile Industry: Used in the production of dyes for textile fibers, providing good wash and light fastness properties.
• Ink Manufacturing: Employed in the formulation of specialty inks, including those for packaging and security printing applications.
• Pigment Synthesis: Acts as an intermediate for creating lake pigments and other colorants used in plastics and coatings.
• Research & Development: Utilized in chemical research for developing new chromophores and studying azo coupling reactions.
• Analytical Reagent: Can function as a complexometric indicator or a staining agent in specific laboratory procedures.

Basic Information

Product Name	7-Hydroxy-8-[(4-Sulphonaphthyl)Azo]Naphthalene-1,3-Disulphonic Acid
CAS No.	7244-14-6
Molecular Formula	C₂₀H₁₂N₂O₁₀S₃
Molecular Weight	536.51 g/mol
Synonyms	Acid Red 299; C.I. 18130; 7-Hydroxy-8-[(4-sulfo-1-naphthyl)azo]naphthalene-1,3-disulfonic acid; 1,3-Naphthalenedisulfonic acid, 7-hydroxy-8-[(4-sulfo-1-naphthyl)azo]-; 8-[(4-Sulfonaphthyl)azo]-7-hydroxynaphthalene-1,3-disulfonic acid; Naphthol AS-SW; Azo dye intermediate 7244-14-6
EINECS	Contact for details

Quality Control

Our 7-Hydroxy-8-[(4-Sulphonaphthyl)Azo]Naphthalene-1,3-Disulphonic Acid is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise specifications for dye intermediate applications. Certificates of Analysis (COA) documenting batch-specific results 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 sealed to minimize exposure to atmospheric humidity.

Specification

Item	Specification
Appearance	Dark brown 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

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