Description

4-[(2-Hydroxy-6-Sulpho-1-Naphthyl)Azo]Naphthalene-1-Sulphonic Acid, Sodium Salt is a high-purity, water-soluble azo dye intermediate essential for producing vivid and stable colorants. Its primary value lies in its ability to impart strong, lightfast shades of red and violet, making it a critical component for manufacturers requiring consistent and reliable coloration. This compound is particularly needed by producers of textile dyes, ink pigments, and specialty coatings who demand precise chemical performance for their formulations.

Application

• Primary Intermediate for Azo Dyes: Serves as a key building block in the synthesis of acid dyes and direct dyes for textiles like wool, silk, and nylon.
• Pigment Manufacturing: Used in the production of high-performance organic pigments for inks, plastics, and coatings.
• Specialty Colorants: Employed in the formulation of specialized dyes for paper, leather, and food-contact materials (where compliant grades are used).
• Laboratory & Research: Acts as a standard or reagent in analytical chemistry and color science research.
• Functional Dyes: Potential applications in the development of dyes for non-textile uses, such as in sensors or imaging technologies.

Basic Information

Item	Details
Product Name	4-[(2-Hydroxy-6-Sulpho-1-Naphthyl)Azo]Naphthalene-1-Sulphonic Acid, Sodium Salt
CAS No.	85283-71-2
Molecular Formula	C20H12N2Na2O8S2
Molecular Weight	518.42 g/mol
Synonyms	Acid Red 337; C.I. 17030; Sodium 4-[(2-hydroxy-6-sulfo-1-naphthyl)azo]-1-naphthalenesulfonate; 1-Naphthalenesulfonic acid, 4-[(2-hydroxy-6-sulfo-1-naphthyl)azo]-, disodium salt; Azo Rubine S; Disodium 4-[(2-hydroxy-6-sulphonato-1-naphthyl)azo]naphthalene-1-sulphonate
EINECS	Contact for details

Quality Control

Our production of 4-[(2-Hydroxy-6-Sulpho-1-Naphthyl)Azo]Naphthalene-1-Sulphonic Acid, Sodium Salt adheres to stringent quality management protocols to ensure batch-to-batch consistency and purity. Every lot is analyzed against rigorous in-house specifications, which typically include identity confirmation, assay, and impurity profile checks. Certificates of Analysis (COA) documenting these results 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, and well-ventilated area at room temperature (15-25°C). Due to its hygroscopic nature, the container must be kept tightly sealed to prevent moisture absorption, which can affect product performance and handling.

Specification

Item	Specification
Appearance	Dark red to violet powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	Contact for details
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.