Description

4-Hydroxy-3-[(2-Hydroxy-4-Nitrophenyl)Azo]Naphthalenesulphonic Acid is a high-purity azo dye intermediate essential for producing vibrant and stable colorants. Its precise molecular structure ensures consistent performance in demanding applications where color fastness and chemical compatibility are critical. This compound is primarily required by manufacturers in the dye and pigment industries, as well as for research and development in advanced material science.

Application

• Primary intermediate for the synthesis of azo dyes and pigments, particularly for orange to red shades.
• Key component in the production of textile dyes for natural and synthetic fibers.
• Used in the formulation of specialized inks for printing and packaging applications.
• Potential use as a colorant or intermediate in the manufacture of paints and coatings.
• Employed in analytical chemistry as a pH indicator or complexometric reagent.
• Research and development of novel functional materials and light-absorbing compounds.

Basic Information

Product Name	4-Hydroxy-3-[(2-Hydroxy-4-Nitrophenyl)Azo]Naphthalenesulphonic Acid
CAS No.	5924-52-7
Molecular Formula	C₁₆H₁₁N₃O₇S
Molecular Weight	389.34 g/mol
Synonyms	Acid Orange 74; C.I. 18745; 4-Hydroxy-3-[(2-hydroxy-4-nitrophenyl)azo]-1-naphthalenesulfonic acid; 1-Naphthalenesulfonic acid, 4-hydroxy-3-[(2-hydroxy-4-nitrophenyl)azo]-; Mordant Orange 74; 4-Hydroxy-3-(2-hydroxy-4-nitrophenylazo)naphthalene-1-sulfonic acid; 4-Hydroxy-3-[(2-hydroxy-4-nitrophenyl)diazenyl]naphthalene-1-sulfonic acid
EINECS	227-663-8

Quality Control

Our 4-Hydroxy-3-[(2-Hydroxy-4-Nitrophenyl)Azo]Naphthalenesulphonic Acid is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure it meets precise chemical and physical specifications. Certificates of Analysis (COA) documenting purity, identity, and impurity profiles are available upon request 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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept sealed to prevent absorption of atmospheric moisture, which can affect product quality and performance.

Specification

Item	Specification
Appearance	Orange to red-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm

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