Description

4-Hydroxy-3-(1-Naphthalenylazo)-2,7-Naphthalenedisulfonic Acid Disodium Salt is a high-purity 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 sought by manufacturers and research laboratories in the dyes and pigments, analytical chemistry, and specialty chemical synthesis sectors for its precise performance characteristics.

Application

• Dye and Pigment Intermediate: A key precursor in the synthesis of specific azo dyes for textiles, inks, and colorants.
• Analytical Reagent: Used as a complexometric indicator or chromogenic agent in spectrophotometric analysis and titration methods.
• Metal Ion Detection: Employed in laboratory settings for the colorimetric detection and quantification of specific metal ions.
• Research & Development: Serves as a building block in organic synthesis for novel compounds in academic and industrial R&D.
• Photographic Chemicals: Potential use in specialized photographic and imaging applications.

Basic Information

Product Name	4-Hydroxy-3-(1-Naphthalenylazo)-2,7-Naphthalenedisulfonic Acid Disodium Salt
CAS No.	5858-64-0
Molecular Formula	C₂₀H₁₂N₂Na₂O₇S₂
Molecular Weight	502.42 g/mol
Synonyms	Acid Red 88; C.I. 15620; 2,7-Naphthalenedisulfonic acid, 4-hydroxy-3-(1-naphthalenylazo)-, disodium salt; Naphthyl Red; Azorubin S; Amidonaphthol Red G; 1-(4-Sulfo-1-naphthylazo)-2-naphthol-6,8-disulfonic acid trisodium salt (related form); 1-(1-Naphthylazo)-2-hydroxy-6,8-naphthalenedisulfonic acid disodium salt
EINECS	227-476-2

Quality Control

Our production of 4-Hydroxy-3-(1-Naphthalenylazo)-2,7-Naphthalenedisulfonic Acid Disodium Salt adheres to stringent quality management protocols. Every batch is analyzed to ensure it meets precise purity and compositional specifications critical for consistent performance in downstream applications. Comprehensive Certificates of Analysis (COA) detailing identity, assay, and impurity profiles are available upon request to support your quality assurance and regulatory 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	Dark red to brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	Reported on COA
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (Water)	Freely soluble

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