Description

Disodium 4-Hydroxynaphthalene-2,6-Disulphonate is a high-purity, water-soluble aromatic sulphonate salt primarily used as a key intermediate in the synthesis of dyes, pigments, and optical brighteners. Its chemical structure provides excellent coupling properties and solubility, making it a critical building block for creating vibrant and stable colorants. This compound is essential for manufacturers in the dye and pigment industries, as well as for research and development in fine chemical synthesis.

Application

• Dye and Pigment Intermediate: A crucial coupling component in the production of azo dyes and pigments for textiles, inks, and plastics.
• Optical Brightener Synthesis: Serves as a key precursor in the manufacture of stilbene-based optical brightening agents (OBAs) for paper, detergents, and textiles.
• Chemical Research & Development: Used as a standardized intermediate in organic synthesis and pharmaceutical research for creating more complex sulfonated compounds.
• Specialty Chemical Manufacturing: Employed in the synthesis of specialty chemicals where specific sulfonation and hydroxylation patterns are required.
• Analytical Chemistry: Can be used as a reference standard or reagent in analytical methods due to its defined structure and properties.

Basic Information

Product Name	Disodium 4-Hydroxynaphthalene-2,6-Disulphonate
CAS No.	24402-46-8
Molecular Formula	C₁₀H₆Na₂O₇S₂
Molecular Weight	348.24 g/mol
Synonyms	2,6-Naphthalenedisulfonic acid, 4-hydroxy-, disodium salt; 4-Hydroxy-2,6-naphthalenedisulfonic acid disodium salt; Disodium 4-hydroxy-2,6-naphthalenedisulfonate; 2,6-NDSA disodium salt; 4-Hydroxy-NDSA disodium salt; Schaeffer's salt disulfonate; Schaeffer's acid disulfonate sodium salt
EINECS	246-230-7

Quality Control

Our Disodium 4-Hydroxynaphthalene-2,6-Disulphonate is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing, including assay (HPLC), identification (IR), and impurity profiling, to ensure it meets precise specifications for use in sensitive synthesis applications. A Certificate of Analysis (COA) detailing all test results is provided with each shipment to guarantee traceability and consistency.

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). This product is hygroscopic (moisture-sensitive); the container must be kept tightly sealed after opening to prevent absorption of atmospheric moisture, which can affect quality and handling properties.

Specification

Item	Specification
Appearance	Off-white to light beige powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Water Content (KF)	≤ 2.0%
pH (5% solution)	6.0 - 8.0
Heavy Metals (as Pb)	≤ 20 ppm

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