Description

1-Hydroxynaphthalene-7-Sulfonic Acid is a key naphthalene derivative sulfonic acid, serving as a versatile intermediate in the synthesis of complex organic molecules. Its value lies in its bifunctional structure, featuring both a phenolic hydroxyl and a sulfonic acid group, which allows for selective reactions and functionalization. This compound is essential for manufacturers in the dye, pigment, and specialty chemical industries seeking to produce high-performance colorants and advanced materials.

Application

• Dye and Pigment Intermediate: A crucial building block for synthesizing azo dyes, acid dyes, and reactive dyes, contributing to color strength and solubility.
• Chemical Synthesis: Used as a starting material or intermediate in the production of more complex naphthalene-based compounds for various industrial applications.
• Research & Development: Employed in laboratory settings for the development of new organic molecules, particularly in materials science and pharmaceutical research.
• Specialty Chemicals: Finds use in the formulation of additives, surfactants, and other performance chemicals where specific aromatic sulfonic acid properties are required.

Basic Information

Item	Detail
Product Name	1-Hydroxynaphthalene-7-Sulfonic Acid
CAS No.	20191-62-2
Molecular Formula	C₁₀H₈O₄S
Molecular Weight	224.23 g/mol
Synonyms	7-Hydroxy-1-naphthalenesulfonic Acid; 1-Naphthol-7-sulfonic Acid; 7-Sulfo-1-naphthol; NSC 40326; 7-Hydroxynaphthalene-1-sulfonic Acid; Peri Acid (related isomer); F Acid (related isomer); 1,7-Cleve's Acid
EINECS	243-588-9

Quality Control

Our 1-Hydroxynaphthalene-7-Sulfonic Acid is produced under a rigorous quality management system. Each batch undergoes comprehensive analytical testing to ensure identity, purity, and consistency. A Certificate of Analysis (COA) detailing key parameters such as assay and impurity profile is provided with every shipment to guarantee it meets your specific application requirements.

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 nature, the container must be kept tightly sealed to prevent moisture absorption, which can affect product quality and handling.

Specification

Item	Specification
Appearance	Off-white to light tan powder or crystals
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
Related Substances (HPLC)	Total impurities ≤ 5.0%
Sulfated Ash	≤ 0.5%

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