Description

1-Hydroxynaphthalene-2-Sulphonic Acid is a key aromatic sulfonic acid derivative, primarily serving as a versatile intermediate in the synthesis of dyes, pigments, and other fine chemicals. Its value lies in its ability to introduce both hydrophilic sulfonic acid and reactive hydroxyl functional groups into complex molecular structures, enabling precise color and property tuning. This compound is essential for manufacturers in the dyestuff, agrochemical, and pharmaceutical industries who require high-purity intermediates for consistent batch-to-batch performance.

Application

• Dye and Pigment Manufacturing: A crucial coupling component and intermediate for producing azo dyes, acid dyes, and lake pigments.
• Agrochemical Synthesis: Used as a building block in the production of certain herbicides and plant growth regulators.
• Pharmaceutical Intermediates: Serves as a precursor in the synthesis of specific active pharmaceutical ingredients (APIs).
• Chemical Research & Development: Employed in organic synthesis for introducing sulfonic acid groups into naphthalene-based structures.
• Corrosion Inhibitor Formulation: A component in specialty chemical blends designed to protect metal surfaces.
• Photographic Chemicals: Used in the synthesis of certain photographic developers and sensitizers.

Basic Information

Product Name	1-Hydroxynaphthalene-2-Sulphonic Acid
CAS No.	567-18-0
Molecular Formula	C₁₀H₈O₄S
Molecular Weight	224.23 g/mol
Synonyms	1-Naphthol-2-sulfonic Acid; 2-Hydroxy-1-naphthalenesulfonic Acid; 2-Naphthol-1-sulfonic Acid; NSC 40326; 1,2-Naphtholsulfonic Acid; Oxytone N; 2-Hydroxynaphthalene-1-sulfonic Acid
EINECS	209-289-7

Quality Control

Our 1-Hydroxynaphthalene-2-Sulphonic Acid is produced under a stringent quality management system. Each batch undergoes comprehensive analytical testing, including assay (HPLC), identification (IR), and impurity profile analysis, to ensure it meets precise customer specifications and industry standards. A Certificate of Analysis (COA) documenting purity, physical properties, and test results is provided with every shipment to guarantee traceability and compliance.

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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed to prevent absorption of atmospheric moisture. Keep away from strong bases and oxidizing agents.

Specification

Item	Specification
Appearance	Off-white to light tan 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.