Description

4-Hydroxy-3-[(4-Methoxy-2-Sulfophenyl)Azo]-6-[Methyl[[2-(Sulfooxy)Ethyl]Sulfonyl]Amino]-2-Naphthalenesulfonic Acid is a high-purity, water-soluble azo dye intermediate of significant commercial importance. Its complex molecular structure, featuring multiple sulfonic acid groups, makes it a critical precursor for synthesizing specialized reactive and acid dyes. This compound is essential for manufacturers in the textile, ink, and specialty coatings industries seeking to produce vivid, wash-fast colors. Our supply is characterized by consistent quality and reliable batch-to-batch uniformity to support demanding industrial processes.

Application

• Primary Intermediate for Reactive Dyes: Key building block for manufacturing high-performance reactive dyes used in cotton, wool, and nylon dyeing.
• Acid Dye Synthesis: Used in the production of acid dyes for coloring silk, wool, and polyamide fibers.
• Specialty Ink Formulations: Serves as a colorant precursor in high-quality inkjet and printing inks requiring specific chromatic properties.
• Industrial Coatings: Employed in the synthesis of pigments and dyes for industrial and automotive coatings.
• Research & Development: Used in chemical R&D for developing new chromophores and studying azo dye chemistry.
• Paper Coloring: Potential application in the manufacture of dyes for specialty paper products.

Basic Information

Item	Details
Product Name	4-Hydroxy-3-[(4-Methoxy-2-Sulfophenyl)Azo]-6-[Methyl[[2-(Sulfooxy)Ethyl]Sulfonyl]Amino]-2-Naphthalenesulfonic Acid
CAS No.	72269-56-8
Molecular Formula	C20H20N4O13S3
Molecular Weight	644.58 g/mol
Synonyms	Reactive Red 198 (Free Acid); C.I. Reactive Red 198; 4-Hydroxy-3-[(4-methoxy-2-sulfophenyl)azo]-6-[methyl[(2-sulfooxyethyl)sulfonyl]amino]-2-naphthalenesulfonic acid; 2-Naphthalenesulfonic acid, 4-hydroxy-3-[(4-methoxy-2-sulfophenyl)azo]-6-[methyl[(2-sulfooxyethyl)sulfonyl]amino]-; Reactive Red 198 acid; Reactive Red 198 intermediate; RR 198 (acid form)
EINECS	Contact for details

Quality Control

Our production of 4-Hydroxy-3-[(4-Methoxy-2-Sulfophenyl)Azo]-6-[Methyl[[2-(Sulfooxy)Ethyl]Sulfonyl]Amino]-2-Naphthalenesulfonic Acid adheres to a stringent quality management system. Every batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise specifications for dye intermediate applications. Certificates of Analysis (COA) documenting all critical parameters are provided to guarantee traceability and compliance with your quality standards.

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 sealed when not in use to prevent absorption of atmospheric moisture, which can affect product performance. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Dark red to brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture (KF)	≤ 5.0%
Solubility (in Water)	Freely soluble
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Total impurities ≤ 3.0%

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