Description

Koch Acid CAS NO 117-42-0 is a high-purity chemical intermediate, specifically the sodium salt of 1-hydroxy-2-naphthoic acid. This compound is valued for its role as a key precursor in the synthesis of azo dyes and pigments, offering excellent coupling properties and color fastness. It is essential for manufacturers in the dyestuff, textile, and specialty chemical industries seeking reliable intermediates for vibrant and durable colorants.

Application

• Primary intermediate in the production of azo dyes and organic pigments.
• Coupling agent for manufacturing dyes used in textiles, leather, and paper.
• Key starting material for high-performance pigments in plastics and coatings.
• Used in the synthesis of certain pharmaceutical intermediates and fine chemicals.
• Research and development chemical in academic and industrial laboratories.

Basic Information

Item	Detail
Product Name	Koch Acid
CAS No.	117-42-0
Molecular Formula	C11H7NaO3
Molecular Weight	210.16 g/mol
Synonyms	Sodium 1-hydroxy-2-naphthoate; 1-Hydroxy-2-naphthoic acid sodium salt; 2-Hydroxy-1-naphthoic acid sodium salt (common misnomer); 1,2-Naphtholsäure Natriumsalz; Oxynaphthoic acid sodium salt; 1-Hydroxy-2-naphthalenecarboxylic acid sodium salt; 1,2-Acid sodium salt
EINECS	204-193-5

Quality Control

Our Koch Acid is manufactured under a strict quality management system. Each batch undergoes comprehensive analytical testing to ensure it meets precise chemical and physical specifications. Certificates of Analysis (COA) documenting purity, identity, and impurity profiles are available for every shipment to guarantee traceability and compliance with your internal standards.

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). Keep away from strong acids and oxidizing agents. The product is hygroscopic (moisture-sensitive); ensure containers are sealed after each use to prevent moisture absorption.

Specification

Item	Specification
Appearance	Off-white to light tan powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
Heavy Metals (as Pb)	≤ 20 ppm
Water Solubility	Freely soluble

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