Description

4-Hydroxy-3-[(2-Hydroxy-1-Naphtyl)Azo]-7-Nitro-1-Naphthalenesulfonic Acid Sodium Salt is a high-purity azo dye intermediate and analytical reagent. This compound is valued for its precise chemical structure, which provides consistent performance in specialized synthesis and colorimetric applications. It is primarily required by manufacturers in the dye and pigment industry, as well as by research laboratories for analytical and diagnostic purposes.

Application

• Key intermediate for the synthesis of specialized azo dyes and pigments.
• Analytical reagent for colorimetric detection and complexometric titrations in laboratory settings.
• Potential component in the formulation of pH indicators and biological stains.
• Used in research and development for novel chromogenic materials.
• May serve as a standard or reference material in quality control laboratories.

Basic Information

Product Name	4-Hydroxy-3-[(2-Hydroxy-1-Naphtyl)Azo]-7-Nitro-1-Naphthalenesulfonic Acid Sodium Salt
CAS No.	30709-28-5
Molecular Formula	C20H12N3NaO7S
Molecular Weight	461.38 g/mol
Synonyms	Acid Red 88; C.I. 15620; 7-Nitro-4-hydroxy-3-[(2-hydroxy-1-naphthyl)azo]-1-naphthalenesulfonic acid sodium salt; Sodium 4-hydroxy-3-[(2-hydroxy-1-naphthyl)azo]-7-nitro-1-naphthalenesulfonate; 1-Naphthalenesulfonic acid, 4-hydroxy-3-[(2-hydroxy-1-naphthyl)azo]-7-nitro-, sodium salt; Azo Rubine S; Azorubin S; Food Red 3 (discontinued use)
EINECS	250-313-3

Quality Control

Our 4-Hydroxy-3-[(2-Hydroxy-1-Naphtyl)Azo]-7-Nitro-1-Naphthalenesulfonic 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 customer specifications. Certificates of Analysis (COA) documenting all critical parameters are available upon request.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Reddish-brown to dark red powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Residue on Ignition (Sulfated Ash)	Contact for details
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Individual impurity ≤ 1.0%; Total impurities ≤ 3.0%

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