Description

Sodium Hydrogen 4-Aminoazobenzene-3,4'-Disulphonate is an important diazo component and intermediate in the synthesis of azo dyes and pigments. This compound is valued for its ability to introduce sulfonic acid groups, enhancing the water solubility and substantivity of the final colorants. It is primarily required by manufacturers in the dye and pigment industry for producing vibrant, light-fast colors for textiles, inks, and specialty coatings.

Application

• Key intermediate for the synthesis of acid dyes and direct dyes used in textile coloring.
• Precursor in the manufacturing of pigments for inks, including printing and packaging inks.
• Building block for reactive dyes used on cotton and other cellulosic fibers.
• Used in research and development of novel chromogenic agents and sensors.
• Intermediate for dyes applied in leather and paper industries.
• Potential use in the synthesis of food colorants (subject to appropriate regulatory approvals and purity grades).

Basic Information

Product Name	Sodium Hydrogen 4-Aminoazobenzene-3,4'-Disulphonate
CAS No.	74543-21-8
Molecular Formula	C12H10N3NaO6S2
Molecular Weight	387.34 g/mol
Synonyms	4-Aminoazobenzene-3,4'-disulfonic acid monosodium salt; Sodium 4-aminoazobenzene-3,4'-disulfonate; 3,4'-Disulfo-4-aminoazobenzene Sodium Salt; Azoic Diazo Component; C.I. 37120; Acid Yellow 36 intermediate; Diazonium salt precursor; 4-(4-Sulfophenylazo)aniline-3-sulfonic acid sodium salt
EINECS	Contact for details

Quality Control

Our Sodium Hydrogen 4-Aminoazobenzene-3,4'-Disulphonate is produced under a stringent quality management system. Each batch undergoes rigorous analytical testing to ensure consistent purity and performance as a dye intermediate. Certificates of Analysis (COA) detailing assay, impurity profile, and physical specifications are available upon request to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive); keep the original container tightly sealed to minimize exposure to atmospheric humidity.

Specification

Item	Specification
Appearance	Yellow to orange-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	Contact for details
Heavy Metals (as Pb)	≤ 20 ppm
Water Solubility	Freely soluble

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