Description

3-Methoxy-4-Amino Azo Benzene-3'-Sulfonic Acid is a specialized azo dye intermediate characterized by its sulfonic acid group and methoxy-substituted aromatic structure. This compound is valued for its role in synthesizing high-value, colorfast dyes and pigments with specific hue and performance characteristics. It is primarily required by manufacturers in the textile, ink, and specialty chemical industries for producing vibrant and durable colorants.

Application

• Key intermediate for the synthesis of azo dyes and pigments, particularly for textile applications.
• Used in manufacturing reactive dyes for cotton and other cellulose fibers.
• Employed in the production of acid dyes for wool, silk, and nylon.
• Acts as a precursor for specialty colorants used in inks and coatings.
• Potential use in the synthesis of functional dyes for non-textile applications, such as in electronics or imaging.
• Serves as a building block for research chemicals and fine chemical synthesis in laboratory settings.

Basic Information

Product Name	3-Methoxy-4-Amino Azo Benzene-3'-Sulfonic Acid
CAS No.	138-28-3
Molecular Formula	C13H13N3O4S
Molecular Weight	307.32 g/mol
Synonyms	4-Amino-3-methoxyazobenzene-3'-sulfonic acid; 3'-Sulfo-4-amino-3-methoxyazobenzene; 4-Amino-3-methoxyazobenzene-3'-sulphonic acid; C.I. 37155; Azobenzene-3'-sulfonic acid, 4-amino-3-methoxy-; 3-Methoxy-4-aminoazobenzene-3'-sulfonic acid; 4-Amino-3-methoxyazobenzene-m-sulfonic acid
EINECS	205-324-9

Quality Control

Our production of 3-Methoxy-4-Amino Azo Benzene-3'-Sulfonic Acid adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing to ensure consistent purity, chemical identity, and performance. Certificates of Analysis (COA) detailing specifications such as assay, impurity profile, and physical characteristics are provided and available upon request to support your quality assurance processes.

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). Keep away from strong oxidizing agents and incompatible materials.

Specification

Item	Specification
Appearance	Brownish to reddish powder or crystals
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm

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