Description

Disodium 4,4'-Bis[(2-Hydroxy-1-Naphthyl)Azo]-5,5'-Dimethyl[1,1'-Biphenyl]-2,2'-Disulphonate 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 demanding high lightfastness and chemical resistance. It is primarily utilized by manufacturers in the textile, leather, and specialty ink industries for dye and pigment synthesis.

Application

• Textile Dyeing: A key intermediate for synthesizing high-performance direct and acid dyes for cotton, wool, and nylon fibers.
• Leather Finishing: Used in the production of dyes for imparting deep, uniform color to leather goods.
• Specialty Inks: Serves as a precursor for pigments in inks requiring specific color strength and stability, such as for packaging and security printing.
• Paper Coloring: Employed in the manufacture of dyes for high-quality paper and cardboard products.
• Research & Development: Used as a standard or reagent in analytical chemistry and material science research involving colorants.
• Functional Dyes: Potential intermediate for dyes used in non-textile applications like lasers or optical data storage.

Basic Information

Product Name	Disodium 4,4'-Bis[(2-Hydroxy-1-Naphthyl)Azo]-5,5'-Dimethyl[1,1'-Biphenyl]-2,2'-Disulphonate
CAS No.	6472-50-0
Molecular Formula	C40H26N4Na2O8S2
Molecular Weight	792.80 g/mol
Synonyms	Direct Brown 2; C.I. 22311; Disodium 4,4'-bis(2-hydroxy-1-naphthylazo)-5,5'-dimethylbiphenyl-2,2'-disulfonate; 4,4'-Bis[(2-hydroxy-1-naphthyl)azo]-5,5'-dimethyl[1,1'-biphenyl]-2,2'-disulfonic acid disodium salt; Azo Brown; Direct Brown 2B; C.I. Direct Brown 2
EINECS	229-310-1

Quality Control

Our production of Disodium 4,4'-Bis[(2-Hydroxy-1-Naphthyl)Azo]-5,5'-Dimethyl[1,1'-Biphenyl]-2,2'-Disulphonate adheres to stringent quality management protocols to ensure batch-to-batch consistency and purity. Each lot is analyzed against comprehensive specifications, including identity, assay, and impurity profiles. 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). Keep away from incompatible materials. Due to its light-sensitive nature, prolonged exposure to direct light should be avoided to maintain product integrity.

Specification

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