Description

7-Hydroxy-8-[[4-(Phenylazo)Phenyl]Azo]Naphthalene-1-Sulfonic Acid Sodium Salt is a high-purity, water-soluble azo dye intermediate known for its vibrant color properties and chemical stability. This compound is essential for manufacturers requiring precise and consistent chromophores for advanced coloration applications. It is primarily utilized by producers in the textile dyeing, ink formulation, and specialty chemical synthesis industries.

Application

• Textile Dyeing: A key intermediate for synthesizing acid dyes and direct dyes for coloring nylon, wool, silk, and paper.
• Ink Manufacturing: Used in the production of pigments for inks in printing, writing, and packaging applications.
• Specialty Pigments: Serves as a precursor for creating high-performance organic pigments used in plastics, coatings, and paints.
• Biological Staining: Potential use in the formulation of histological stains for laboratory and diagnostic purposes.
• Chemical Research: Employed as a standard or reagent in organic synthesis and photochemical studies.
• Analytical Chemistry: Can be used as a colorimetric indicator or tracer in specific analytical methods.

Basic Information

Product Name	7-Hydroxy-8-[[4-(Phenylazo)Phenyl]Azo]Naphthalene-1-Sulfonic Acid Sodium Salt
CAS No.	6226-73-9
Molecular Formula	C22H15N4NaO4S
Molecular Weight	454.43 g/mol
Synonyms	Sodium 7-hydroxy-8-[(E)-2-[4-[(E)-phenyldiazenyl]phenyl]diazen-1-yl]naphthalene-1-sulfonate; 1-Naphthalenesulfonic acid, 7-hydroxy-8-[[4-(phenylazo)phenyl]azo]-, sodium salt; C.I. 18050; Acid Orange 20; Sodium 8-[(4-phenylazophenyl)azo]-7-hydroxynaphthalene-1-sulfonate; Azo dye intermediate OA20; 7-Hydroxy-8-(p-(phenylazo)phenylazo)-1-naphthalenesulfonic acid sodium salt
EINECS	228-317-6

Quality Control

Our 7-Hydroxy-8-[[4-(Phenylazo)Phenyl]Azo]Naphthalene-1-Sulfonic Acid Sodium Salt is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise specifications for dye and pigment synthesis. Certificates of Analysis (COA) documenting all critical parameters 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 performance and stability.

Specification

Item	Specification
Appearance	Orange to brownish-red powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	15.0% - 20.0%
Heavy Metals (as Pb)	≤ 20 ppm
Water Solubility	Freely soluble

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