Description

1-Naphthalenesulfonic Acid, 4-[[2,4-Dihydroxy-5-[(7-Sulfo-1-Naphthalenyl)Azo]Phenyl]Azo]-, Disodium Salt is a high-purity, water-soluble azo dye intermediate of significant commercial importance. This compound is valued for its ability to impart vibrant and stable color properties in advanced formulations. It is primarily sought after by manufacturers in the textile, ink, and specialty chemical industries for the synthesis of complex dyes and pigments.

Application

• Primary Intermediate for Azo Dyes: A key building block in the synthesis of high-performance, polyazo direct dyes and acid dyes for textiles like wool, silk, and nylon.
• Specialty Ink Production: Used in the manufacture of colorants for inks requiring specific hue, brightness, and stability, including some jet printing inks.
• Pigment Manufacturing: Serves as a precursor in the production of lake pigments and other colorants for plastics and coatings.
• Laboratory & Research: Employed as a standard or reagent in chemical research focused on dye chemistry, photochemistry, and analytical method development.
• Paper Coloring: Potential use in the production of dyes for specialty paper products where specific color fastness is required.

Basic Information

Product Name	1-Naphthalenesulfonic Acid, 4-[[2,4-Dihydroxy-5-[(7-Sulfo-1-Naphthalenyl)Azo]Phenyl]Azo]-, Disodium Salt
CAS No.	75627-16-6
Molecular Formula	C26H16N4Na2O9S2
Molecular Weight	630.52 g/mol
Synonyms	Direct Brown 44 (disodium salt); C.I. 35005; 4-[[2,4-Dihydroxy-5-[(7-sulfo-1-naphthyl)azo]phenyl]azo]-1-naphthalenesulfonic acid disodium salt; 1,5-Naphthalenedisulfonic acid, 3,3'-[(2,4-dihydroxy-1,5-phenylene)bis(azo)]bis-, disodium salt; Acid Brown 44; Pontamine Brown BRL; Benzo Brown BRL; Azo dye intermediate 75627-16-6
EINECS	Contact for details

Quality Control

Our production of this dye intermediate adheres to rigorous quality control protocols to ensure batch-to-batch consistency and purity. Quality is verified through analytical techniques including HPLC, UV-Vis spectroscopy, and titration. A comprehensive Certificate of Analysis (COA) detailing identity, assay, impurity profile, and physical specifications is provided with each shipment to support your quality assurance systems.

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). Keep away from strong oxidizing agents. The product is hygroscopic (moisture-sensitive); ensure containers are sealed after use to prevent moisture absorption.

Specification

Item	Specification
Appearance	Dark brown to black powder or granules
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Water Content	≤ 5.0%
Sulfated Ash	≤ 20.0%
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.