Description

Trisodium 3-Hydroxy-4-[(2-Sulphonatophenyl)Azo]Naphthalene-2,7-Disulphonate 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: A key intermediate for producing reactive and direct dyes for cotton, wool, and nylon, offering bright shades and good wash-fastness.
• Ink Manufacturing: Used in the synthesis of pigments for inks in packaging, printing, and writing applications, providing strong color strength.
• Paper Coloring: Employed in the production of dyes for specialty papers and paper products requiring high color uniformity.
• Leather Finishing: Serves as a colorant intermediate in dyes for leather goods, ensuring deep, even coloration.
• Biological Staining: Potential use as a precursor for histological stains in laboratory and diagnostic applications.
• Chemical Synthesis: Acts as a versatile building block for further chemical modification in organic synthesis and research.

Basic Information

Product Name	Trisodium 3-Hydroxy-4-[(2-Sulphonatophenyl)Azo]Naphthalene-2,7-Disulphonate
CAS No.	93942-40-6
Molecular Formula	C16H9N2Na3O10S3
Molecular Weight	586.39 g/mol
Synonyms	Acid Red 337; C.I. 17200; Trisodium 3-hydroxy-4-[(2-sulfophenyl)azo]-2,7-naphthalenedisulfonate; 3-Hydroxy-4-[(2-sulfophenyl)azo]-2,7-naphthalenedisulfonic acid trisodium salt; 2,7-Naphthalenedisulfonic acid, 3-hydroxy-4-[(2-sulfophenyl)azo]-, trisodium salt; Reactive Red Dye Intermediate; Azo Dye Intermediate 93942-40-6
EINECS	Contact for details

Quality Control

Our Trisodium 3-Hydroxy-4-[(2-Sulphonatophenyl)Azo]Naphthalene-2,7-Disulphonate is manufactured under strict quality control protocols to ensure high purity and consistency. Every batch is tested against stringent in-house specifications, which typically include parameters for assay, impurity profile, and solubility. Certificates of Analysis (COA) documenting these results are available upon request to support your quality assurance and regulatory 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 (moisture-sensitive) nature, the container must be kept tightly sealed after each use to prevent absorption of atmospheric moisture, which can affect product performance.

Specification

Item	Specification
Appearance	Reddish-brown to dark brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	Contact for details
Solubility (in Water)	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.