Description

2-Hydroxy-5-[(5-Sulfo-2-Naphthalenyl)Azo]Benzoic Acid Disodium Salt is a high-purity azo dye intermediate and analytical reagent. This compound is valued for its strong chromophoric properties and water solubility, making it a critical component for precise color development and detection. It is primarily required by manufacturers in the dye and pigment industry, as well as by research laboratories for use as a specialized reagent in analytical chemistry and biochemical assays.

Application

• Dye and Pigment Manufacturing: A key intermediate for the synthesis of acid dyes, particularly for wool, silk, and nylon, due to its sulfonated, water-soluble structure.
• Analytical Chemistry Reagent: Used as a colorimetric reagent or indicator in complexometric titrations and for the detection of specific metal ions.
• Biochemical Staining: Potential application as a histological stain or in specific biochemical assays that require azo-based chromophores.
• Ink Formulation: Can be utilized in the production of specialized inks where specific color fastness and solubility properties are required.
• Research & Development: Serves as a building block in organic synthesis for novel chromophores and functional materials research.

Basic Information

Product Name	2-Hydroxy-5-[(5-Sulfo-2-Naphthalenyl)Azo]Benzoic Acid Disodium Salt
CAS No.	10114-96-2
Molecular Formula	C17H10N2Na2O7S
Molecular Weight	440.31 g/mol
Synonyms	Acid Orange 7 Disodium Salt; C.I. 15510; 5-[(5-Sulfo-2-naphthyl)azo]salicylic acid disodium salt; Tropaeolin D; Orange II; 2-Naphthalenesulfonic acid, 5-[(2-hydroxy-5-sulfophenyl)azo]-, disodium salt; Benzoic acid, 2-hydroxy-5-[(5-sulfo-2-naphthalenyl)azo]-, disodium salt
EINECS	233-322-6

Quality Control

Our 2-Hydroxy-5-[(5-Sulfo-2-Naphthalenyl)Azo]Benzoic Acid Disodium Salt is produced under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure consistent purity, color strength, and chemical identity. Certificates of Analysis (COA) detailing assay, impurity profile, and physical specifications are available for every shipment to support your quality assurance protocols.

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); ensure containers are sealed after each use to minimize exposure to atmospheric moisture.

Specification

Item	Specification
Appearance	Orange to red-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	≤ 30.0%
Heavy Metals (as Pb)	≤ 20 ppm
Water Solubility	Freely soluble

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