Description

Sodium 5-Sulfoisatin is an organosulfur compound and the sodium salt of 5-sulfoisatin. This versatile chemical intermediate is valued for its role in synthesizing functional dyes, pigments, and specialty polymers, where it imparts water-solubility and anionic character. It is primarily utilized by manufacturers in the dye and pigment, pharmaceutical, and advanced materials industries seeking to develop products with enhanced solubility and specific chromophoric properties.

Application

• Dye and Pigment Intermediate: A key precursor in the synthesis of water-soluble acid dyes, reactive dyes, and food colorants.
• Pharmaceutical Synthesis: Serves as a building block for active pharmaceutical ingredients (APIs) and diagnostic agents.
• Polymer Modification: Used to introduce sulfonate groups into polymers to improve hydrophilicity and antistatic properties.
• Analytical Chemistry: Employed as a reagent or standard in chromatographic analysis and research.
• Photographic Chemicals: A component in the formulation of certain light-sensitive materials and developers.
• Textile Auxiliaries: Used in the production of specialty textile chemicals and finishing agents.

Basic Information

Product Name	Sodium 5-Sulfoisatin
CAS No.	80789-74-8
Molecular Formula	C8H4NNaO5S
Molecular Weight	249.17 g/mol
Synonyms	5-Sulfoisatin Sodium Salt; Isatin-5-sulfonic Acid Sodium Salt; 1H-Indole-2,3-dione, 5-sulfo-, Sodium Salt; Sodium 2,3-Dioxoindoline-5-sulfonate; 5-Sulphoisatin Sodium Salt; 5-SIA Na; 5-Sulfoisatin Sodium Salt
EINECS	Contact for details

Quality Control

Our Sodium 5-Sulfoisatin is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure it meets high-purity standards suitable for synthesis and industrial applications. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with every shipment to guarantee traceability and 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). This product is hygroscopic (moisture-sensitive) and must be kept in a dry environment to prevent degradation. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Yellow to orange-yellow powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Water Content (KF)	≤ 2.0%
Residue on Ignition	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm

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