Description

5-(4-Amino-Phenylazo)-2-Hydroxy-Benzoic Acid is an azo dye intermediate of significant commercial importance, characterized by its distinct molecular structure containing both amino and carboxylic acid functional groups. This compound serves as a critical building block for synthesizing a range of high-value, colorfast dyes and pigments used in demanding industrial applications. Manufacturers in the textile, ink, and specialty chemical sectors rely on this intermediate for its consistent quality and reactivity to produce vibrant and durable colors.

Application

• Primary Intermediate for Azo Dyes: Essential for the synthesis of acid dyes, direct dyes, and reactive dyes used in textile coloring for wool, silk, nylon, and cotton.
• Pigment Manufacturing: Used in the production of organic pigments for inks, plastics, coatings, and artists' colors, providing excellent tinting strength.
• Laboratory Reagent: Employed in research and development as a standard or starting material for novel chromophore synthesis and photochemical studies.
• Specialty Chemical Synthesis: Acts as a key precursor for functional dyes used in biological staining, sensors, and nonlinear optical materials.

Basic Information

Product Name	5-(4-Amino-Phenylazo)-2-Hydroxy-Benzoic Acid
CAS No.	101-51-9
Molecular Formula	C13H11N3O3
Molecular Weight	257.25 g/mol
Synonyms	5-[(4-Aminophenyl)azo]-2-hydroxybenzoic acid; 4-Aminoazobenzene-2'-carboxylic acid; C.I. 13010; 2-Hydroxy-5-[(4-aminophenyl)azo]benzoic acid; 5-(p-Amino-phenylazo)-salicylic acid; Azodye Intermediate Yellow; Benzoic acid, 5-[(4-aminophenyl)azo]-2-hydroxy-
EINECS	202-949-5

Quality Control

Our production of 5-(4-Amino-Phenylazo)-2-Hydroxy-Benzoic Acid adheres to stringent quality management protocols to ensure batch-to-batch consistency and reliability. Every lot is analyzed against comprehensive specifications, including purity (Assay), identity (IR), and impurity profile (HPLC). A Certificate of Analysis (COA) detailing all test results is provided with each shipment to support your quality assurance and regulatory compliance needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from strong oxidizing agents and incompatible materials.

Specification

Item	Specification
Appearance	Orange to brownish-red crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 1.0%
Residue on Ignition	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm

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