Description

3-(Phenylazo)-4,5-Dihydroxy-2,7-Naphthalenedisulfonic Acid is a high-purity, water-soluble azo dye intermediate and analytical reagent. This compound is valued for its strong chromophoric properties and ability to form stable complexes with various metal ions. It is primarily utilized by manufacturers in the dye and pigment industry, as well as by research laboratories for analytical chemistry applications.

Application

• Dye and Pigment Synthesis: A key intermediate for producing azo dyes, particularly acid dyes for textiles like wool, silk, and nylon.
• Analytical Reagent: Used as a chromogenic agent in spectrophotometric methods for the detection and quantification of metal ions.
• Complexometric Indicator: Serves as an indicator in titrations involving metal ions due to its distinct color change upon complexation.
• Biological Staining: Potential application in histological staining for microscopic analysis in life sciences.
• Chemical Research: Employed in organic synthesis and materials science research for developing new functional dyes and sensors.
• Ink Formulation: Used in the development of specialized inks requiring specific color properties and stability.

Basic Information

Item	Detail
Product Name	3-(Phenylazo)-4,5-Dihydroxy-2,7-Naphthalenedisulfonic Acid
CAS No.	13432-13-8
Molecular Formula	C₁₆H₁₂N₂O₈S₂
Molecular Weight	424.41 g/mol
Synonyms	Acid Chrome Blue K; 2,7-Naphthalenedisulfonic acid, 4,5-dihydroxy-3-(phenylazo)-; 4,5-Dihydroxy-3-(phenylazo)-2,7-naphthalenedisulfonic acid; Chrome Azurol S; C.I. Mordant Blue 29; Aluminon; Aurintricarboxylic acid ammonium salt (related compound); Aluminum reagent
EINECS	Contact for details

Quality Control

Our 3-(Phenylazo)-4,5-Dihydroxy-2,7-Naphthalenedisulfonic Acid is produced under a strict quality management system. Every batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise specifications. A Certificate of Analysis (COA) detailing all test results is provided with each shipment to guarantee traceability and compliance.

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 light-sensitive (store away from light) and hygroscopic (moisture-sensitive). Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	Dark brown to reddish-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Residue on Ignition (Sulfated Ash)	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (in Water)	Clear, red-brown solution

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