Description

6-[(4-Aminophenyl)Azo]-5-Hydroxynaphthalene-1-Sulphonic Acid is a specialized azo dye intermediate, also known as a diazo component, valued for its ability to impart vibrant and stable colors. This compound is essential for synthesizing high-performance dyes and pigments, particularly those requiring excellent lightfastness and chemical resistance. It is primarily needed by manufacturers in the textile, leather, and specialty ink industries for producing high-quality colorants.

Application

• Primary Intermediate for Azo Dyes: Serves as a key coupling component in the synthesis of acid dyes and direct dyes for textiles like wool, silk, and nylon.
• Leather Dyeing: Used in the production of dyes for coloring leather goods, offering good penetration and color uniformity.
• Paper Coloring: Employed in the manufacture of dyes for specialty papers and packaging materials.
• Ink Formulation: A component in the production of pigments for inks, including those used in printing and writing instruments.
• Research & Development: Utilized in chemical research for developing new chromophores and studying azo coupling reactions.

Basic Information

Product Name	6-[(4-Aminophenyl)Azo]-5-Hydroxynaphthalene-1-Sulphonic Acid
CAS No.	25305-93-5
Molecular Formula	C16H13N3O4S
Molecular Weight	343.36 g/mol
Synonyms	5-Hydroxy-6-[(4-aminophenyl)azo]-1-naphthalenesulfonic acid; 6-[(4-Aminophenyl)azo]-5-hydroxy-1-naphthalenesulfonic acid; 1-Naphthalenesulfonic acid, 6-[(4-aminophenyl)azo]-5-hydroxy-; C.I. 18050; Acid Orange 33 intermediate; 4-Aminoazobenzene-2'-sulfonic acid-1'-naphthol-6'; Azoic Diazo Component 12; Azo dye intermediate BA
EINECS	Contact for details

Quality Control

Our production of 6-[(4-Aminophenyl)Azo]-5-Hydroxynaphthalene-1-Sulphonic Acid adheres to stringent quality management protocols. Every batch undergoes rigorous analytical testing to ensure consistent purity, identity, and performance. Certificates of Analysis (COA) documenting key parameters such as assay, impurity profile, and physical characteristics are 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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Orange to brown powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility	Soluble in alkaline water

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