Description

4-Hydroxynaphthalene-2,6-Disulphonic Acid is a key aromatic sulfonic acid derivative, serving as a versatile and critical intermediate in the synthesis of high-value colorants and specialty chemicals. Its molecular structure, featuring both hydroxyl and sulfonic acid groups, makes it an essential building block for creating compounds with specific solubility and chromophoric properties. This product is primarily sought after by manufacturers in the dyestuff, pigment, and fine chemical industries for developing advanced materials and colorants.

Application

• Dyestuff Intermediate: A crucial precursor in the synthesis of acid dyes, direct dyes, and reactive dyes, particularly for textile applications requiring bright and stable colors.
• Pigment Manufacturing: Used in the production of organic pigments and lake pigments, where it contributes to color strength and stability in plastics, inks, and coatings.
• Chemical Synthesis: Acts as a key intermediate for producing more complex sulfonated naphthalene derivatives used in specialty chemicals and pharmaceutical intermediates.
• Optical Brightener Production: Employed in the manufacture of certain classes of fluorescent whitening agents (FWAs) for paper and detergent industries.
• Research & Development: Serves as a standard or starting material in academic and industrial R&D labs for exploring new synthetic pathways and functional materials.

Basic Information

Product Name	4-Hydroxynaphthalene-2,6-Disulphonic Acid
CAS No.	6483-80-3
Molecular Formula	C₁₀H₈O₇S₂
Molecular Weight	304.30 g/mol
Synonyms	2,6-Dihydroxynaphthalene-4-sulfonic Acid; 4-Hydroxy-2,6-naphthalenedisulfonic Acid; 2,6-Naphthalenedisulfonic Acid, 4-hydroxy-; NSC 40326; 1-Hydroxy-3,7-naphthalenedisulfonic Acid; 4-Hydroxy-2,6-NDSA; 4-Hydroxynaphthalene-2,6-disulfonic Acid
EINECS	229-340-4

Quality Control

Our production of 4-Hydroxynaphthalene-2,6-Disulphonic Acid adheres to stringent quality management protocols to ensure batch-to-batch consistency and reliability. Each lot undergoes comprehensive analytical testing, including assay, impurity profiling, and confirmation of identity. A Certificate of Analysis (COA) detailing all test results is provided with every shipment, and we support customer-specific quality audits and regulatory requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area away from incompatible materials such as strong bases and oxidizing agents. Due to its acidic nature, containers should be kept tightly sealed to prevent moisture absorption and contamination. Recommended storage temperature is 15-25°C.

Specification

Item	Specification
Appearance	Off-white to light tan crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 1.0%
Sulfated Ash	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Total impurities ≤ 2.0%

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