Description

3-Hydroxy-4-[(2-Hydroxynaphthyl)Azo]-7-Nitronaphthalene-1-Sulphonic Acid is a specialized azo dye intermediate of significant commercial importance. Its value lies in its role as a key precursor for synthesizing high-performance, colorfast dyes and pigments, particularly in the red to violet spectrum. This compound is essential for manufacturers in the textile, ink, and specialty coatings industries seeking to produce vivid and durable colors.

Application

• Primary intermediate for the synthesis of azo dyes and pigments, especially those yielding red, violet, and maroon shades.
• Manufacturing of textile dyes for cotton, wool, silk, and synthetic fibers requiring good light and wash fastness.
• Production of printing inks for packaging, security printing, and high-quality publications.
• Key component in the formulation of industrial pigments for plastics, paints, and coatings.
• Used in the development of specialty colorants for leather, paper, and other substrates.
• Potential use as a reagent or analytical standard in chemical research and quality control laboratories.

Basic Information

Product Name	3-Hydroxy-4-[(2-Hydroxynaphthyl)Azo]-7-Nitronaphthalene-1-Sulphonic Acid
CAS No.	16279-54-2
Molecular Formula	C₂₀H₁₃N₃O₇S
Molecular Weight	439.40 g/mol
Synonyms	7-Nitro-3-hydroxy-4-[(2-hydroxy-1-naphthyl)azo]-1-naphthalenesulfonic acid; C.I. 15865; Acid Red 299; 1-Naphthalenesulfonic acid, 7-nitro-3-hydroxy-4-[(2-hydroxy-1-naphthyl)azo]-; 4-[(2-Hydroxy-1-naphthyl)azo]-7-nitro-3-hydroxy-1-naphthalenesulfonic acid; 3-Hydroxy-4-[(2-hydroxy-1-naphthalenyl)azo]-7-nitro-1-naphthalenesulfonic acid; Azo dye intermediate 16279-54-2
EINECS	Contact for details

Quality Control

Our production of 3-Hydroxy-4-[(2-Hydroxynaphthyl)Azo]-7-Nitronaphthalene-1-Sulphonic Acid adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing to ensure consistent purity, color strength, and chemical identity. Certificates of Analysis (COA) detailing assay, impurity profile, and physical specifications are available upon request to support your quality assurance and regulatory compliance needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from strong oxidizing agents and incompatible materials. Due to its complex organic structure, prolonged exposure to elevated temperatures or humidity should be avoided to maintain product integrity.

Specification

Item	Specification
Appearance	Dark red to brown powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility	Soluble in alkaline water; sparingly soluble in neutral water

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