Description

4-[(4-Amino-7-Sulfo-1-Naphthalenyl)Azo]-1-Naphthalenesulfonic Acid Disodium Salt is a high-purity, water-soluble azo dye intermediate essential for producing vibrant and stable colorants. Its primary value lies in its dual sulfonic acid groups, which impart excellent solubility and binding properties in aqueous systems. This compound is critically needed by manufacturers in the textile, ink, and specialty chemical industries for synthesizing direct and reactive dyes.

Application

• Primary Intermediate for Azo Dyes: Key building block for synthesizing direct, acid, and reactive dyes used in textile coloring.
• Textile Industry: Used in the production of dyes for cotton, wool, silk, and nylon, offering good wash and light fastness.
• Ink Manufacturing: Serves as a precursor for pigments in inks for packaging, printing, and writing instruments.
• Paper Coloring: Employed in the manufacture of dyes for coloring paper and paper products.
• Leather Dyeing: Used in formulations for dyeing leather goods.
• Biological Staining: Potential use as an intermediate for histochemical stains and indicators in laboratory settings.
• Research & Development: Serves as a standard or reagent in chemical research for studying azo coupling reactions and dye chemistry.

Basic Information

Product Name	4-[(4-Amino-7-Sulfo-1-Naphthalenyl)Azo]-1-Naphthalenesulfonic Acid Disodium Salt
CAS No.	68310-69-0
Molecular Formula	C₂₀H₁₂N₄Na₂O₆S₂
Molecular Weight	514.44 g/mol
Synonyms	Acid Red 337; C.I. 17200; 1-Naphthalenesulfonic acid, 4-[(4-amino-7-sulfo-1-naphthalenyl)azo]-, disodium salt; Disodium 4-[(4-amino-7-sulphonato-1-naphthyl)azo]naphthalene-1-sulphonate; Azo Dye Intermediate 68310-69-0; 4-[(4-Amino-7-sulfonato-1-naphthyl)azo]-1-naphthalenesulfonate disodium salt
EINECS	Contact for details

Quality Control

Our production of 4-[(4-Amino-7-Sulfo-1-Naphthalenyl)Azo]-1-Naphthalenesulfonic Acid Disodium Salt adheres to stringent quality management protocols. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure consistency and compliance with industry specifications. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and physical properties is provided with each shipment to guarantee traceability and quality assurance for our global B2B clients.

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); ensure the container is kept tightly sealed to prevent absorption of atmospheric moisture, which can affect product stability and performance.

Specification

Item	Specification
Appearance	Dark red to brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Water Content (KF)	≤ 5.0%
pH (1% Solution)	6.0 - 8.0
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (in Water)	Freely soluble

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