Description

Disodium 2-Naphthol-3,6-Disulfonate is a high-purity, water-soluble aromatic sulfonate salt widely used as a key intermediate in chemical synthesis. Its primary commercial value lies in its role as a versatile precursor for the production of dyes, pigments, and fluorescent whitening agents. This compound is essential for manufacturers in the dyestuff, textile, paper, and specialty chemical industries seeking reliable and consistent raw materials for their processes.

Application

• Dye and Pigment Intermediate: A crucial building block for synthesizing azo dyes, acid dyes, and reactive dyes, imparting color and properties to textiles and leather.
• Fluorescent Whitening Agent (FWA) Production: Serves as a key starting material in the manufacture of optical brighteners used in detergents, paper, and plastics.
• Chemical Synthesis: Used as an intermediate in organic synthesis for creating more complex sulfonated compounds and specialty chemicals.
• Research & Development: Employed in laboratory settings for developing new colorants, analytical reagents, and functional materials.
• Photographic Chemicals: Can be utilized in the formulation of certain photographic chemicals and sensitizers.

Basic Information

Product Name	Disodium 2-Naphthol-3,6-Disulfonate
CAS No.	135-51-3
Molecular Formula	C10H6Na2O7S2
Molecular Weight	348.24 g/mol
Synonyms	2-Naphthol-3,6-disulfonic acid disodium salt; R Salt; Disodium 3,6-dihydroxynaphthalene-2,7-disulfonate; Disodium 6-hydroxy-2-naphthalenesulfonate-3-sulfonate; Sodium 2-naphthol-3,6-disulfonate; 3,6-Dihydroxynaphthalene-2,7-disulfonic acid disodium salt; Acid Red R Salt; C.I. 16500
EINECS	205-199-7

Quality Control

Our Disodium 2-Naphthol-3,6-Disulfonate 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. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profiles, and physical parameters is provided with every shipment to guarantee traceability and compliance with your quality 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). Keep away from strong oxidizing agents and incompatible materials. The product is hygroscopic (moisture-sensitive); ensure containers are sealed after use to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Off-white to light beige powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm
Water Solubility	Clear solution

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