Description

Disodium 5,5'-[Sulphonylbis(3,1-Phenyleneazo)]Bis[6-Amino-4-Hydroxynaphthalene-2-Sulphonate] is a high-purity, water-soluble disazo dye intermediate of significant industrial importance. Its complex molecular structure, featuring multiple sulphonate groups, provides excellent solubility and binding properties, making it a critical precursor for high-performance colorants. This compound is primarily sought after by manufacturers in the textile, leather, paper, and specialty ink industries for synthesizing vibrant and durable dyes and pigments.

Application

• Primary Intermediate for Disazo Dyes: Serves as a key building block in the synthesis of direct, acid, and reactive dyes for textiles like cotton, wool, and nylon.
• Leather Coloring Agent: Used in the production of dyes for imparting deep, uniform colors to leather goods.
• Paper Dye Manufacturing: Employed in creating colorants for high-quality paper and packaging materials.
• Specialty Ink Formulation: A precursor for pigments used in inks for jet printing, security printing, and other advanced applications.
• Research & Development: Utilized in chemical research for developing new chromophores and studying azo dye chemistry.

Basic Information

Product Name	Disodium 5,5'-[Sulphonylbis(3,1-Phenyleneazo)]Bis[6-Amino-4-Hydroxynaphthalene-2-Sulphonate]
CAS No.	70210-45-6
Molecular Formula	C32H20N6Na2O12S3
Molecular Weight	830.70 g/mol
Synonyms	Direct Blue 218 (Intermediate); C.I. 24401; Disodium 5,5'-(sulfonylbis(3,1-phenyleneazo))bis(6-amino-4-hydroxy-2-naphthalenesulfonate); 5,5'-[Sulfonylbis(3,1-phenylenazo)]bis[6-amino-4-hydroxy-2-naphthalenesulfonic acid] disodium salt; Azo dye intermediate 70210-45-6; Bisazo dye sulfonate; Acid Blue 218 intermediate
EINECS	Contact for details

Quality Control

Our production of this disazo dye intermediate adheres to strict quality management protocols to ensure batch-to-batch consistency and high purity. Every lot is analyzed using advanced techniques like HPLC to confirm identity and assay. A comprehensive Certificate of Analysis (COA) detailing purity, impurity profile, and physical specifications is provided with each shipment to support your quality assurance processes.

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 (moisture-sensitive) nature, the container must be kept sealed to prevent absorption of atmospheric moisture, which can affect product quality and handling properties.

Specification

Item	Specification
Appearance	Dark blue to black powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Water Solubility	Freely soluble
Heavy Metals (as Pb)	≤ 20 ppm

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