Description

Disodium 8,8'-[[1,1'-Biphenyl]-4,4'-Diylbis(Azo)]Bis(7-Hydroxynaphthalene-1-Sulphonate) is a high-purity, water-soluble azo dye intermediate known for its distinct chromophoric properties. This compound is critical for producing vivid and stable colorants, particularly in applications requiring high lightfastness and chemical resistance. It is primarily utilized by manufacturers in the textile, ink, and specialty polymer industries seeking reliable and consistent dye precursors.

Application

• Primary Intermediate for Azo Dyes: Key starting material for synthesizing direct, acid, and reactive dyes for textiles and leather.
• Ink Manufacturing: Used in the production of high-performance pigments for printing inks, including packaging and security inks.
• Functional Polymer Additive: Imparts color or acts as a functional monomer in the synthesis of specialty polymers and plastics.
• Laboratory Reagent: Serves as a standard or reagent in analytical chemistry and colorimetric research.
• Paper Coloring: Employed in the manufacture of colored papers and paper products.
• Biological Staining: Potential use in histological stains and biological imaging applications.

Basic Information

Item	Details
Product Name	Disodium 8,8'-[[1,1'-Biphenyl]-4,4'-Diylbis(Azo)]Bis(7-Hydroxynaphthalene-1-Sulphonate)
CAS No.	2302-97-8
Molecular Formula	C32H18N4Na2O8S2
Molecular Weight	696.59 g/mol
Synonyms	Direct Blue 1; C.I. 24410; Azo Blue 1; Pontamine Blue 2B; Disodium 4,4'-bis(7-hydroxy-8-sulfo-1-naphthylazo)biphenyl-4,4'-diylbis(azo)bis(naphthalene-1-sulfonate); 4,4'-Bis[(7-hydroxy-8-sulfo-1-naphthyl)azo]biphenyl disodium salt; Benzo Blue 2B
EINECS	218-964-4

Quality Control

Our production of Disodium 8,8'-[[1,1'-Biphenyl]-4,4'-Diylbis(Azo)]Bis(7-Hydroxynaphthalene-1-Sulphonate) adheres to stringent quality protocols to ensure batch-to-batch consistency and high purity. Each lot is tested against comprehensive specifications, including identity, assay, and impurity profiles. Certificates of Analysis (COA) documenting all test results are available upon request to support your quality assurance and regulatory compliance 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 sealed to minimize exposure to atmospheric moisture.

Specification

Item	Specification
Appearance	Dark blue to violet powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	≤ 20.0%
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.