Description

4-Aminoazobenzene-4'-Sulfonic Acid Sodium Salt is a water-soluble, anionic azo dye intermediate and analytical reagent. This compound is valued for its role as a versatile precursor in the synthesis of acid dyes, food colorants, and biological stains. It is primarily required by manufacturers in the dye and pigment, analytical chemistry, and life science research sectors.

Application

• Dye and Pigment Manufacturing: A key intermediate for producing acid dyes, direct dyes, and food colorants (e.g., Sunset Yellow FCF).
• Analytical Chemistry: Used as a pH indicator and a reagent in spectrophotometric analysis and complexometric titrations.
• Biological Staining: Employed in histological and cytological staining procedures for microscopic examination.
• Textile Industry: Applied in the dyeing of protein fibers like wool, silk, and nylon due to its sulfonic acid group.
• Research & Development: Serves as a model compound in photochemical studies and for investigating azo dye degradation pathways.
• Ink Formulation: Used in the production of specialized inks requiring specific color properties and solubility.

Basic Information

Product Name	4-Aminoazobenzene-4'-Sulfonic Acid Sodium Salt
CAS No.	2491-71-6
Molecular Formula	C12H10N3NaO3S
Molecular Weight	299.28 g/mol
Synonyms	Acid Orange 12; C.I. 15970; 4-[(4-Aminophenyl)azo]benzenesulfonic acid sodium salt; Sodium 4-[(4-aminophenyl)azo]benzenesulfonate; Orange IV; Tropaeolin O; 4-Aminoazobenzene-4-sulfonate sodium salt; 4-Aminoazobenzene-4'-sulfonic acid sodium salt
EINECS	219-672-8

Quality Control

Our 4-Aminoazobenzene-4'-Sulfonic Acid Sodium Salt is manufactured under a strict quality management system. Each batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise specifications. Certificates of Analysis (COA) detailing all test results are provided to guarantee batch-to-batch consistency and compliance with customer requirements.

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). This material is hygroscopic (moisture-sensitive); keep the container tightly sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Orange to reddish-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
Water Solubility	Freely soluble
Heavy Metals (as Pb)	≤ 20 ppm
Residue on Ignition	≤ 0.5%

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