Description

Naphthol As-S CAS NO 2672-81-3 is a high-purity, light-sensitive azo dye coupling agent and chemical intermediate. This compound is valued for its critical role in producing vivid and stable pigments and dyes for industrial applications. It is an essential raw material for manufacturers in the textile, leather, and specialty chemical industries seeking consistent quality and reliable performance in their colorant formulations.

Application

• Primary coupling component for the synthesis of azo pigments and dyes.
• Key intermediate in the production of textile colorants for cotton and synthetic fibers.
• Used in the manufacture of leather dyes and finishing agents.
• Employed in the creation of specialty inks for printing applications.
• Acts as a chemical building block for advanced organic synthesis in research and development.
• Utilized in the production of colorants for plastics and polymers.

Basic Information

Product Name	Naphthol As-S
CAS No.	2672-81-3
Molecular Formula	C17H13NO2
Molecular Weight	263.29 g/mol
Synonyms	3-Hydroxy-2-naphthanilide; Naphthol AS-S; C.I. Azoic Coupling Component 7; Naphthol AS/S; 2-Hydroxy-3-naphthoic acid anilide; 3-Hydroxy-N-phenyl-2-naphthamide; Azoic Coupling Component 7; Naphthol ASS
EINECS	220-219-3

Quality Control

Our Naphthol As-S is manufactured under strict quality control protocols to ensure high purity and batch-to-batch consistency. The product is tested against rigorous internal specifications, which typically include parameters for assay, melting point, and impurity profiles. A Certificate of Analysis (COA) detailing the results is provided with each shipment to guarantee 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 room temperature (15-25°C). Keep away from incompatible materials such as strong oxidizing agents.

Specification

Item	Specification
Appearance	Off-white to light beige powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Melting Point	243 - 247 °C
Loss on Drying	≤ 0.5%
Ash Content	≤ 0.3%

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