Description

1,5-Naphthalenedisulfonic Acid Tetrahydrate is a versatile aromatic sulfonic acid derivative, primarily valued as a key intermediate in the synthesis of dyes, pigments, and optical brighteners. Its disulfonic acid structure provides excellent water solubility and reactivity, making it a crucial building block for creating complex, high-performance molecules. This compound is essential for manufacturers in the dyestuff, textile chemical, and specialty chemical industries seeking reliable, high-purity intermediates.

Application

• Dye and Pigment Intermediate: A critical precursor in the synthesis of acid dyes, direct dyes, and reactive dyes, particularly for textiles and leather.
• Optical Brightener Production: Serves as a fundamental building block for manufacturing stilbene-based optical brightening agents (OBAs) used in paper, detergents, and plastics.
• Chemical Synthesis: Used as a sulfonating agent and a versatile intermediate in organic synthesis for pharmaceuticals and agrochemicals.
• Electroplating Additives: Functions as a brightening agent and complexing agent in electroplating baths for metal surface finishing.
• Concrete Admixtures: Can be utilized in the formulation of polycarboxylate-based superplasticizers for advanced concrete mixtures.
• Research & Development: Employed in academic and industrial R&D labs for developing new sulfonated polymers and specialty chemicals.

Basic Information

Product Name	1,5-Naphthalenedisulfonic Acid Tetrahydrate
CAS No.	211366-30-2
Molecular Formula	C₁₀H₆O₆S₂·4H₂O
Molecular Weight	362.34 g/mol (Tetrahydrate)
Synonyms	1,5-Naphthalenedisulfonic Acid Hydrate; Naphthalene-1,5-disulfonic Acid Tetrahydrate; 1,5-NDSA Tetrahydrate; 1,5-Naphthalene Disulphonic Acid; Armorite; 1,5-Dihydroxynaphthalene-3,7-disulfonic Acid (related); Dinaphthol Disulfonic Acid; EINECS Contact for details

Quality Control

Our 1,5-Naphthalenedisulfonic Acid Tetrahydrate is produced under a stringent quality management system. Each batch undergoes comprehensive analytical testing to ensure consistent purity, identity, and performance. Certificates of Analysis (COA) detailing specifications such as assay, moisture content, and impurity profiles are provided with every shipment to guarantee supply reliability and technical compliance for your 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). This product is hygroscopic (moisture-sensitive) and should be kept away from strong bases and oxidizing agents to maintain stability and purity.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Water Content (KF)	18.0 - 22.0% (Theoretical for Tetrahydrate: ~19.9%)
Sulfate Ash	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm

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