Description

Sodium 7-Hydroxynaphthalene-1-Sulphonate is a high-purity, water-soluble aromatic sulfonate salt that serves as a critical intermediate in the synthesis of dyes, pigments, and optical brighteners. Its molecular structure provides excellent coupling properties and chromophore development, making it indispensable for creating vivid and stable colors. This compound is primarily sought after by manufacturers in the dye and pigment industry, as well as by research institutions developing advanced organic materials and specialty chemicals.

Application

• Dye and Pigment Intermediate: A key coupling component in the production of azo dyes, acid dyes, and reactive dyes for textiles, leather, and paper.
• Optical Brightener Synthesis: Used as a foundational building block in the manufacture of stilbene-based optical brightening agents (OBAs) for detergents and papers.
• Chemical Research & Development: Serves as a versatile starting material or standard in organic synthesis for novel sulfonated compounds and functional materials.
• Pharmaceutical Intermediates: Potential use in the synthesis of certain sulfonated pharmaceutical compounds and diagnostic agents.
• Analytical Chemistry: Can be employed as a reagent or standard in chromatographic analysis and other laboratory procedures.

Basic Information

Product Name	Sodium 7-Hydroxynaphthalene-1-Sulphonate
CAS No.	832-85-9
Molecular Formula	C₁₀H₇NaO₄S
Molecular Weight	246.21 g/mol
Synonyms	7-Hydroxy-1-naphthalenesulfonic acid sodium salt; 1-Naphthol-7-sulfonic acid sodium salt; Sodium 7-hydroxy-1-naphthalenesulfonate; 7-Hydroxynaphthalene-1-sulfonic acid sodium salt; 7-Hydroxy-1-naphthalenesulphonate sodium; 1,7-Cleve's acid sodium salt (related isomer); 7-Hydroxy-1-naphthalenesulphonic acid sodium salt; 7-Hydroxy-1-sulfonaphthalene sodium salt
EINECS	212-622-5

Quality Control

Our Sodium 7-Hydroxynaphthalene-1-Sulphonate is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, identity, and consistency. We provide comprehensive Certificates of Analysis (COA) with each shipment, detailing key parameters such as assay, impurity profile, and physical characteristics. Our quality commitment ensures reliable performance for your critical synthesis and production processes.

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 prevent absorption of atmospheric moisture, which can affect product quality and handling.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
Water Solubility	Freely soluble
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Total impurities ≤ 2.0%
pH (5% Solution)	6.0 - 8.0

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