Description

4,5-Dihydroxy-2,7-Naphthalenedisulfonic Acid Disodium Salt is a high-purity, water-soluble aromatic compound that serves as a versatile intermediate and functional additive in advanced chemical synthesis. Its core value lies in its dual sulfonate and dihydroxy functional groups, which provide excellent chelating, dispersing, and dye-modifying properties. This product is essential for manufacturers in the dye and pigment, pharmaceutical, and specialty chemical industries seeking to develop or enhance product performance. Its consistent quality ensures reliable results in critical applications.

Application

• Dye and Pigment Intermediate: A key precursor in the synthesis of acid dyes, reactive dyes, and optical brighteners, where it contributes to color fastness and solubility.
• Pharmaceutical Synthesis: Used as a building block or chelating agent in the production of certain active pharmaceutical ingredients (APIs) and diagnostic agents.
• Chemical Synthesis: Functions as a versatile intermediate for creating complex organic molecules, including ligands for catalysts and metal complexes.
• Analytical Reagent: Employed in analytical chemistry as a chelating agent for metal ion detection and separation processes.
• Dispersing Agent: Acts as an effective dispersant for pigments and other solids in aqueous formulations, improving stability and homogeneity.
• Water Treatment Additive: Utilized in formulations for scale inhibition and as a sequestrant for metal ions in industrial water systems.

Basic Information

Product Name	4,5-Dihydroxy-2,7-Naphthalenedisulfonic Acid Disodium Salt
CAS No.	388633-48-5
Molecular Formula	C₁₀H₆Na₂O₈S₂
Molecular Weight	372.23 g/mol
Synonyms	2,7-Naphthalenedisulfonic acid, 4,5-dihydroxy-, disodium salt; 4,5-Dihydroxynaphthalene-2,7-disulfonic acid disodium salt; Disodium 4,5-dihydroxynaphthalene-2,7-disulfonate; Chromotropic acid disodium salt (related but not identical, often used in searches); 4,5-DHNDS disodium salt; DHNDS-Na₂
EINECS	Contact for details

Quality Control

Our 4,5-Dihydroxy-2,7-Naphthalenedisulfonic Acid Disodium Salt is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure it meets exacting specifications. A Certificate of Analysis (COA) detailing all test results is provided with each shipment, guaranteeing traceability and compliance with your technical requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after opening to prevent absorption of atmospheric moisture, which can affect product quality and handling.

Specification

Item	Specification
Appearance	Off-white to light yellow powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Water Content (KF)	≤ 2.0%
Residue on Ignition	≤ 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.