Description

Disodium 7-Hydroxy-8-[[4-[(4-Sulphonatophenyl)Azo]Phenyl]Azo]Naphthalene-2-Sulphonate is a high-purity, water-soluble azo dye intermediate known for its excellent chromophore properties and stability. This compound is critical for manufacturers requiring precise color development and consistent batch-to-batch performance in demanding applications. It is primarily utilized by the textile, ink, and specialty chemical industries for the synthesis of vibrant and durable dyes and pigments.

Application

• Textile Dyeing: As a key intermediate for producing high-quality, wash-fast azo dyes for cotton, wool, and synthetic fibers.
• Ink Manufacturing: For the formulation of printing inks, including those for packaging and security printing, requiring specific color shades and lightfastness.
• Pigment Synthesis: In the production of organic pigments used in plastics, paints, and coatings to achieve bright and stable colors.
• Research & Development: As a standard or reagent in chemical research for studying azo coupling reactions and dye chemistry.
• Specialty Chemicals: As a functional intermediate in the synthesis of more complex colorants for niche industrial applications.
• Biological Staining: Potential use as a precursor for histological stains in laboratory settings, subject to further purification.

Basic Information

Item	Details
Product Name	Disodium 7-Hydroxy-8-[[4-[(4-Sulphonatophenyl)Azo]Phenyl]Azo]Naphthalene-2-Sulphonate
CAS No.	6226-74-0
Molecular Formula	C22H14N4Na2O8S2
Molecular Weight	604.48 g/mol
Synonyms	Acid Orange 20 (disodium salt); C.I. 17730; 7-Hydroxy-8-[[4-[(4-sulfophenyl)azo]phenyl]azo]naphthalene-2-sulfonic acid disodium salt; Disodium 7-hydroxy-8-[(E)-[4-[(E)-(4-sulfonatophenyl)diazenyl]phenyl]diazenyl]naphthalene-2-sulfonate; Azo Orange; Acid Leather Orange AG; Dermina Orange AG; Amacid Orange AG
EINECS	228-324-3

Quality Control

Our Disodium 7-Hydroxy-8-[[4-[(4-Sulphonatophenyl)Azo]Phenyl]Azo]Naphthalene-2-Sulphonate 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 intermediate applications. A comprehensive Certificate of Analysis (COA) detailing purity, impurity profile, and physical characteristics is provided with each shipment to guarantee traceability and compliance.

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). Keep away from strong oxidizing agents and incompatible materials. The product is light-sensitive (store away from light).

Specification

Item	Specification
Appearance	Orange to reddish-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	≤ 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.