Description

5,5'-[1,4-Phenylenebis(Azo)]Bis[2-Hydroxy-3-Sodiosulfobenzoic Acid Sodium] Salt is a high-purity, water-soluble azo dye intermediate with excellent tinctorial strength. This compound is valued for its role in synthesizing vibrant and stable colorants, particularly for demanding industrial applications. It is primarily sought by manufacturers in the textile, paper, and specialty ink industries for producing high-quality dyes and pigments.

Application

• Primary Intermediate for Azo Dyes: A key building block in the synthesis of direct, acid, and reactive azo dyes for textiles (cotton, wool, nylon).
• Paper Coloring Agent: Used in the production of dyes for coloring paper and paperboard, offering good affinity for cellulose fibers.
• Specialty Ink Formulation: Employed in the manufacture of inks for jet printing, packaging, and security applications requiring specific color properties.
• Leather Dyeing: Serves as an intermediate for dyes used in the leather tanning and finishing industry.
• Laboratory & Research: Used as a standard or reagent in chemical research, analytical chemistry, and photochemical studies.
• Potential Biological Staining: May find application as a histological stain or in the development of colorimetric detection assays.

Basic Information

Product Name	5,5'-[1,4-Phenylenebis(Azo)]Bis[2-Hydroxy-3-Sodiosulfobenzoic Acid Sodium] Salt
CAS No.	6492-53-1
Molecular Formula	C26H14N4Na4O16S4
Molecular Weight	846.60 g/mol
Synonyms	Acid Yellow 9, Sodium Salt; C.I. 13015; 5,5'-(1,4-Phenylenediazo)di(2-hydroxybenzenesulfonic acid) tetrasodium salt; Direct Yellow 9; Benzenesulfonic acid, 5,5'-[1,4-phenylenebis(azo)]bis[2-hydroxy-, tetrasodium salt; Tetrasodium 5,5'-(1,4-phenylenediazo)di(salicylate-3-sulfonate); Yellow GS
EINECS	229-356-8

Quality Control

Our production of 5,5'-[1,4-Phenylenebis(Azo)]Bis[2-Hydroxy-3-Sodiosulfobenzoic Acid Sodium] Salt adheres to stringent quality protocols to ensure batch-to-batch consistency and performance. Each lot is analyzed against comprehensive specifications, including purity (Assay), color strength, and impurity profile. A Certificate of Analysis (COA) detailing all test results is provided with every shipment to support your quality assurance and regulatory needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive); keep the container tightly sealed when not in use to prevent absorption of atmospheric moisture, which may affect product performance and handling.

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	25.0 - 35.0%
Water Solubility	Freely soluble
Heavy Metals (as Pb)	≤ 20 ppm

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