Description

Trisodium 4,5-Dihydro-4-[[4-(6-Methyl-7-Sulphonatobenzothiazol-2-Yl)Phenyl]Azo]-5-Oxo-1-(4-Sulphonatophenyl)-1H-Pyrazole-3-Carboxylate is a high-purity, water-soluble anionic dye intermediate of significant commercial importance. Its value lies in its role as a key precursor for synthesizing high-performance, lightfast, and washfast dyes, particularly for technical textiles and specialty papers. This compound is essential for manufacturers in the dye and pigment industry seeking to produce vibrant, durable colors for demanding applications.

Application

• Primary Intermediate for Reactive Dyes: A critical building block in the synthesis of high-quality reactive dyes for cotton, viscose, and other cellulosic fibers.
• Production of Acid Dyes: Used in the manufacture of acid dyes for coloring wool, silk, and nylon, offering excellent levelness and brightness.
• Specialty Paper Dyes: Employed in the production of dyes for high-grade papers, security papers, and decorative laminates requiring specific color properties.
• Functional Colorants: Serves as a precursor for dyes used in ink-jet inks, leather finishing, and other industrial coloration processes.
• Research & Development: A valuable chemical for R&D laboratories developing new chromophores and advanced dye molecules with enhanced properties.

Basic Information

Item	Details
Product Name	Trisodium 4,5-Dihydro-4-[[4-(6-Methyl-7-Sulphonatobenzothiazol-2-Yl)Phenyl]Azo]-5-Oxo-1-(4-Sulphonatophenyl)-1H-Pyrazole-3-Carboxylate
CAS No.	6442-00-8
Molecular Formula	C26H15N5Na3O11S3
Molecular Weight	770.56 g/mol
Synonyms	Reactive Orange 16 Intermediate; C.I. Reactive Orange 16 (sodium salt); Trisodium 1-(4-sulfophenyl)-4-[[4-(6-methyl-7-sulfo-2-benzothiazolyl)phenyl]azo]-5-oxo-4,5-dihydro-1H-pyrazole-3-carboxylate; Reactive Orange 16 Sodium Salt; 4,5-Dihydro-4-[[4-(6-methyl-7-sulphonatobenzothiazol-2-yl)phenyl]azo]-5-oxo-1-(4-sulphonatophenyl)-1H-pyrazole-3-carboxylate trisodium salt; C.I. 17757; Reactive Orange M-2R Intermediate; Dye Intermediate 6442-00-8
EINECS	229-233-8

Quality Control

Our production of Trisodium 4,5-Dihydro-4-[[4-(6-Methyl-7-Sulphonatobenzothiazol-2-Yl)Phenyl]Azo]-5-Oxo-1-(4-Sulphonatophenyl)-1H-Pyrazole-3-Carboxylate adheres to stringent quality management systems to ensure batch-to-batch consistency and purity. Every lot is analyzed against rigorous in-house specifications, which typically include parameters for assay (HPLC), impurity profile, solubility, and color strength. A comprehensive Certificate of Analysis (COA) detailing all test results is provided with each shipment to guarantee compliance with your technical requirements.

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 to prevent moisture absorption, which can affect product quality and handling properties.

Specification

Item	Specification
Appearance	Orange to reddish-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture (KF)	≤ 5.0%
Water Solubility	Clear solution at 1%
Heavy Metals (as Pb)	≤ 20 ppm
pH (1% Solution)	7.0 - 9.0

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