Description

4-Hydroxy-5-[[4-[(2-Hydroxy-1-Naphthalenyl)Azo]-1-Naphthalenyl]Azo]Benzene-1,3-Disulfonic Acid Disodium Salt is a high-purity, water-soluble azo dye intermediate of significant industrial importance. Its complex molecular structure, featuring dual azo linkages and sulfonic acid groups, makes it a critical precursor for synthesizing vibrant and stable dyes and pigments. This compound is essential for manufacturers in the textile, ink, and specialty chemical industries seeking to produce high-performance colorants with excellent fastness properties.

Application

• Primary Intermediate for Azo Dyes: Serves as a key building block in the synthesis of acid dyes, direct dyes, and reactive dyes used for coloring nylon, wool, silk, and paper.
• Pigment Manufacturing: Used in the production of high-grade organic pigments for inks, coatings, and plastics, providing excellent color strength and dispersion.
• Textile Industry: Enables the creation of specific, vivid shades (often oranges, reds, and browns) with good wash and light fastness for textile fabrics.
• Biological Staining: Potential use as a staining agent in histology and microscopy due to its chromophoric properties, though specific grades must be qualified.
• Research & Development: Employed in chemical research as a model compound for studying azo coupling reactions, dye chemistry, and photophysical properties.
• Specialty Chemical Synthesis: Acts as a functional intermediate for creating more complex molecules used in advanced materials and analytical reagents.

Basic Information

Item	Details
Product Name	4-Hydroxy-5-[[4-[(2-Hydroxy-1-Naphthalenyl)Azo]-1-Naphthalenyl]Azo]Benzene-1,3-Disulfonic Acid Disodium Salt
CAS No.	6406-63-9
Molecular Formula	C26H16N4Na2O8S2
Molecular Weight	630.53 g/mol
Synonyms	Acid Orange 20 (C.I. 14630); 4-Hydroxy-3-((4-((2-hydroxynaphthalen-1-yl)diazenyl)naphthalen-1-yl)diazenyl)benzene-1,3-disulfonic acid disodium salt; 1-Naphthalenesulfonic acid, 4-hydroxy-3-((4-((2-hydroxy-1-naphthalenyl)azo)-1-naphthalenyl)azo)-, disodium salt; Disodium 4-hydroxy-3-((4-((2-hydroxynaphthalen-1-yl)diazenyl)naphthalen-1-yl)diazenyl)benzene-1,3-disulfonate; C.I. Acid Orange 20; Azo Orange Dye Intermediate; Dye Intermediate 6406-63-9
EINECS	229-077-5

Quality Control

Our production of 4-Hydroxy-5-[[4-[(2-Hydroxy-1-Naphthalenyl)Azo]-1-Naphthalenyl]Azo]Benzene-1,3-Disulfonic Acid Disodium Salt adheres to a stringent quality management system. Each batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure consistent performance and batch-to-batch reliability. A detailed Certificate of Analysis (COA) specifying purity, impurity profile, and physical characteristics is provided with every 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). Due to its hygroscopic nature, the container must be kept tightly sealed after opening to prevent moisture absorption, which can affect product stability and handling properties. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Orange to reddish-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0% (typical 97-99%)
Water Content (KF)	≤ 5.0%
pH (1% Solution)	6.0 - 8.0
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (in Water)	Freely soluble

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