Description

4,5-Dihydroxynaphthalene-1-Sulphonic Acid is a versatile naphthalene derivative that serves as a critical intermediate in the synthesis of dyes, pigments, and specialty chemicals. Its bifunctional structure, featuring both hydroxyl and sulphonic acid groups, makes it a valuable building block for creating compounds with specific solubility and chromophoric properties. This product is essential for manufacturers in the dye and pigment industry, as well as for research institutions developing advanced organic materials and analytical reagents.

Application

• Dye and Pigment Intermediate: A key precursor in the synthesis of azo dyes, acid dyes, and metal-complex pigments, contributing to color strength and stability.
• Chemical Synthesis: Used as a versatile building block for creating more complex organic molecules in pharmaceutical and agrochemical research.
• Analytical Reagent: Employed in laboratory settings as a reagent for the detection and quantification of specific metal ions or in chromatographic studies.
• Photographic Chemicals: Can be utilized in the formulation of certain photographic developers and sensitizers.
• Corrosion Inhibitor Formulation: Acts as a component in specialty formulations designed to protect metal surfaces.
• Research & Development: Serves as a standard or starting material in organic chemistry research for novel compound development.

Basic Information

Product Name	4,5-Dihydroxynaphthalene-1-Sulphonic Acid
CAS No.	83-65-8
Molecular Formula	C₁₀H₈O₅S
Molecular Weight	240.23 g/mol
Synonyms	1,8-Dihydroxynaphthalene-4-sulfonic Acid; 4,5-Dihydroxy-1-naphthalenesulfonic Acid; 1-Naphthalenesulfonic acid, 4,5-dihydroxy-; Chromotropic Acid (Note: This is a common name, but often refers specifically to the sodium salt); 4,5-Dihydroxynaphthalene-1-sulfonic acid; 5-Hydroxy-1-naphthol-4-sulfonic Acid; 1,8-Dihydroxynaphthalene-4-sulphonic Acid
EINECS	201-494-0

Quality Control

Our 4,5-Dihydroxynaphthalene-1-Sulphonic Acid is produced under strict quality management protocols. Each batch undergoes comprehensive analytical testing to ensure it meets precise chemical and physical specifications. We provide a detailed Certificate of Analysis (COA) with every shipment, confirming parameters such as purity, identity, and impurity profiles. Our quality systems are designed to support applications requiring high consistency and reliability.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated place at room temperature (15-25°C). This compound is hygroscopic (moisture-sensitive) and should be kept under conditions that minimize exposure to atmospheric humidity. Keep away from strong oxidizing agents and incompatible materials.

Specification

Item	Specification
Appearance	Off-white to light brown crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
Sulfated 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.