Description

Disodium p-[4,5-Dihydro-4-[[2-Methoxy-5-Methyl-4-[[2-(Sulphonatooxy)Ethyl]Sulphonyl]Phenyl]Azo]-3-Methyl-5-Oxo-1H-Pyrazol-1-Yl]Benzenesulphonate is a high-purity, water-soluble anionic dye intermediate, specifically a reactive dye precursor. This compound is valued for its ability to impart bright, wash-fast colors and its reactivity with textile fibers, ensuring excellent bonding and durability. It is a critical raw material for manufacturers of reactive dyes targeting the textile, leather, and specialty paper industries, where consistent quality and batch-to-batch reliability are paramount.

Application

• Primary Intermediate for Reactive Dyes: Synthesis of high-performance reactive dyes for cotton, viscose, and other cellulosic fibers.
• Textile Dyeing and Printing: Used in exhaust, pad-batch, and continuous dyeing processes to achieve vibrant red and related shades with excellent fastness properties.
• Leather Coloring: Application in dyeing leather goods, providing rich color and good penetration.
• Paper Industry: Manufacture of colored specialty papers and paper products requiring high color strength.
• Ink Formulation: A component in the production of certain types of inks for specialized applications.
• Research & Development: Serves as a key chemical entity in R&D for developing new dye molecules and colorants.

Basic Information

Product Name	Disodium p-[4,5-Dihydro-4-[[2-Methoxy-5-Methyl-4-[[2-(Sulphonatooxy)Ethyl]Sulphonyl]Phenyl]Azo]-3-Methyl-5-Oxo-1H-Pyrazol-1-Yl]Benzenesulphonate
CAS No.	25664-81-7
Molecular Formula	C26H25N4Na2O13S3
Molecular Weight	750.64 g/mol
Synonyms	Reactive Red 198 (Free Acid); C.I. Reactive Red 198; Disodium 5-[[4-[[2-(2-Sulfatooxyethylsulfonyl)-4-methyl-5-methoxyphenyl]azo]-3-methyl-5-oxo-1H-pyrazol-1-yl]benzenesulfonate; Benzenesulfonic acid, 5-[[4-[[2-(2-sulfatooxyethylsulfonyl)-4-methyl-5-methoxyphenyl]azo]-3-methyl-5-oxo-1H-pyrazol-1-yl]-, disodium salt; Reactive Red 198 precursor; Dye intermediate 25664-81-7; 1,3-Benzenedisulfonic acid, 5-[[4-[[2-(2-sulfatooxyethylsulfonyl)-4-methyl-5-methoxyphenyl]azo]-3-methyl-5-oxo-1H-pyrazol-1-yl]-, disodium salt
EINECS	Contact for details

Quality Control

Our production of Disodium p-[4,5-Dihydro-4-[[2-Methoxy-5-Methyl-4-[[2-(Sulphonatooxy)Ethyl]Sulphonyl]Phenyl]Azo]-3-Methyl-5-Oxo-1H-Pyrazol-1-Yl]Benzenesulphonate adheres to stringent quality management systems. Every batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure it meets the high standards required for dye synthesis. Certificates of Analysis (COA) detailing purity, impurity profile, and physical parameters are provided with each shipment to guarantee traceability and consistency for our global B2B clients.

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 opening 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%
Water Content (KF)	≤ 5.0%
pH (1% Solution)	6.0 - 8.0
Heavy Metals (as Pb)	≤ 20 ppm
Solubility in Water	Freely soluble

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