Description

3-Hydroxy-4-[4-(Phenylazo)Phenylazo]-2,7-Naphthalenedisulfonic Acid is a specialized disazo dye intermediate with a complex aromatic structure. This compound is valued for its ability to impart vivid and stable color properties in advanced dye synthesis. It is primarily required by manufacturers in the dyestuff, pigment, and specialty chemical industries for producing high-performance colorants.

Application

• Primary Intermediate for Azo Dyes: A key building block in the synthesis of high-grade disazo dyes, particularly for shades of orange, red, and brown.
• Textile Dye Manufacturing: Used in the production of dyes for coloring natural and synthetic fibers, including cotton, wool, and nylon.
• Pigment Production: Serves as a precursor in the manufacture of organic pigments for inks, paints, and plastics.
• Leather and Paper Coloring: Employed in the formulation of dyes for specialty applications in leather tanning and paper products.
• Research & Development: Utilized in chemical R&D for developing new chromophores and studying structure-color relationships.
• Specialty Chemical Synthesis: Acts as a functional intermediate for creating complex molecules in fine chemical and pharmaceutical research.

Basic Information

Product Name	3-Hydroxy-4-[4-(Phenylazo)Phenylazo]-2,7-Naphthalenedisulfonic Acid
CAS No.	70693-53-7
Molecular Formula	C22H15N4O7S2
Molecular Weight	503.51 g/mol
Synonyms	Acid Orange 61; C.I. 18870; 2,7-Naphthalenedisulfonic acid, 3-hydroxy-4-[(4-phenylazophenyl)azo]-; 3-Hydroxy-4-(4-phenylazophenylazo)-2,7-naphthalenedisulfonic acid; 4-[(E)-(4-[(E)-Phenyldiazenyl]phenyl)diazenyl]-3-hydroxy-2,7-naphthalenedisulfonic acid; Disazo dye intermediate OA-61; C.I. Acid Orange 61
EINECS	Contact for details

Quality Control

Our production of 3-Hydroxy-4-[4-(Phenylazo)Phenylazo]-2,7-Naphthalenedisulfonic 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) documenting key parameters are available upon request to support your quality assurance and regulatory needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Orange to reddish-brown powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 0.5%
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.