Description

Tetrasodium 5,5'-[Thiobis[(3-Sulphonato-p-Phenylene)Azo]]Disalicylate is a high-purity, water-soluble azo dye intermediate and complexing agent. This compound is valued for its strong chelating properties and vivid color, making it a critical component in formulations requiring precise metal ion control and stable coloration. It is primarily needed by manufacturers in the textile dyeing, paper coloring, and specialty chemical synthesis industries for producing consistent, high-quality end products.

Application

• Textile Dyeing & Printing: As a key intermediate for producing reactive and direct dyes, providing excellent color fastness and brightness on cotton and cellulose fibers.
• Paper Industry: Used in the coloring of paper and paperboard, offering good affinity for cellulose and consistent hue.
• Specialty Chemical Synthesis: Serves as a versatile building block for synthesizing more complex azo dyes and pigments.
• Metal Complex Dyes: Functions as a ligand to form stable complexes with transition metals like chromium and cobalt for metal-complex dyes.
• Analytical Reagent: Employed in laboratory settings as a colorimetric indicator or chelating agent in specific analytical methods.
• Ink Formulation: Used in the production of certain industrial inks where water solubility and color stability are required.

Basic Information

Product Name	Tetrasodium 5,5'-[Thiobis[(3-Sulphonato-p-Phenylene)Azo]]Disalicylate
CAS No.	6391-20-4
Molecular Formula	C26H12N4Na4O16S3
Molecular Weight	858.57 g/mol
Synonyms	Acid Blue 193 (disodium salt); C.I. 15707; Tetrasodium 5,5'-[thiobis[(3-sulfonato-1,4-phenylene)azo]]bis(salicylate); 5,5'-[Thiobis[(3-sulfonato-p-phenylene)azo]]disalicylic acid tetrasodium salt; Direct Blue 193; Salicylic acid, 5,5'-[thiobis[(3-sulfonato-p-phenylene)azo]]di-, tetrasodium salt; Tetrasodium 5,5'-[thiobis(3-sulfonato-p-phenylenazo)]disalicylate
EINECS	228-985-2

Quality Control

Our Tetrasodium 5,5'-[Thiobis[(3-Sulphonato-p-Phenylene)Azo]]Disalicylate is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, color strength, and chemical identity. Certificates of Analysis (COA) detailing key parameters are available upon request to support your quality assurance and regulatory compliance 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 nature, protect from moisture and store away from incompatible materials.

Specification

Item	Specification
Appearance	Dark blue to purple powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	≤ 30.0%
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.