Description

2,2'-Thiobis[5-[(4-Hydroxyphenyl)Azo]Benzenesulphonic] Acid, Sodium Salt is a high-purity, water-soluble azo dye intermediate and specialty chemical. This compound is valued for its role as a critical building block in the synthesis of advanced colorants and functional materials. It is primarily required by manufacturers in the dye and pigment, polymer, and specialty chemical industries seeking consistent quality for precise formulation control.

Application

• Primary intermediate for the synthesis of high-performance azo dyes and pigments, particularly for textiles and inks.
• Key component in the production of functional dyes for non-textile applications, including paper coloring and specialty coatings.
• Used in research and development of advanced polymeric materials with specific optical or chromophoric properties.
• Potential precursor for analytical reagents and indicators in laboratory and diagnostic settings.
• Employed in the manufacture of colorants for plastics and masterbatches.

Basic Information

Product Name	2,2'-Thiobis[5-[(4-Hydroxyphenyl)Azo]Benzenesulphonic] Acid, Sodium Salt
CAS No.	93920-33-3
Molecular Formula	C30H20N4O8S3•2Na
Molecular Weight	~746.7 g/mol
Synonyms	2,2'-Thiobis[5-(4-hydroxyphenylazo)benzenesulfonic acid] disodium salt; Acid Yellow 219 (C.I. 13915); Azo dye intermediate 93920-33-3; Disodium 2,2'-thiobis[5-[(4-hydroxyphenyl)azo]benzenesulfonate]; Bis(5-[(4-hydroxyphenyl)azo]benzenesulfonic acid) sulfide disodium salt; C.I. 13915; Thio-bis azo dye intermediate
EINECS	Contact for details

Quality Control

Our production of 2,2'-Thiobis[5-[(4-Hydroxyphenyl)Azo]Benzenesulphonic] Acid, Sodium Salt adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure it meets exacting industry and customer specifications. Certificates of Analysis (COA) detailing all relevant parameters are provided with each shipment to guarantee traceability and batch-to-batch consistency.

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, the container must be kept tightly sealed after opening to prevent moisture absorption, 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	Contact for details
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (in Water)	Clear solution

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