Description

Naphthol As-D CAS NO 135-61-5 is a high-purity azoic coupling component, specifically a naphthol derivative, essential for producing vivid and durable pigments and dyes. Its primary value lies in its ability to form insoluble azo pigments with excellent color fastness, light stability, and chemical resistance upon diazotization and coupling. This compound is critically needed by manufacturers in the textile dyeing, paint, ink, and plastics industries for coloring a wide range of synthetic and natural materials.

Application

• Azo Pigment Synthesis: As a key coupling component for producing high-performance organic pigments, including Pigment Red and Pigment Orange series.
• Textile Dyeing: Used in the manufacture of dyes for coloring cotton, viscose, and other cellulosic fibers, providing excellent wash and light fastness.
• Printing Inks: Imparts strong, stable colors in various ink formulations for packaging, publications, and security printing.
• Paints and Coatings: Contributes to the colorant system in industrial and decorative paints, offering good dispersion and weather resistance.
• Plastics and Polymers: Used for mass coloration of plastics such as PVC, polyolefins, and styrenics, ensuring color stability during processing.
• Research & Development: Serves as a chemical intermediate in organic synthesis and for developing new colorant technologies in laboratory settings.

Basic Information

Product Name	Naphthol As-D
CAS No.	135-61-5
Molecular Formula	C₁₇H₁₃NO₂
Molecular Weight	263.29 g/mol
Synonyms	3-Hydroxy-2-naphthanilide; Naphthol AS-D; C.I. Azoic Coupling Component 18; C.I. 37520; N-(2-Hydroxynaphthyl)benzamide; 2-Hydroxy-3-naphthoic acid anilide; Naphthanilide AS-D; Azoic Coupling Component 18
EINECS	205-207-3

Quality Control

Our Naphthol As-D is manufactured under a stringent quality management system to ensure batch-to-batch consistency and high purity. The product undergoes rigorous analytical testing, including HPLC for assay and impurity profiling, to meet exacting industry specifications. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and physical parameters is provided with each shipment to support your quality assurance protocols.

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). Keep away from strong oxidizing agents and incompatible materials.

Specification

Item	Specification
Appearance	Off-white to light beige powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.5%
Melting Point	243 - 247 °C
Loss on Drying	≤ 0.5%
Ash Content	≤ 0.2%
Solubility (in NaOH)	Clear, yellow solution

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