Description

4,4'-[[3,3'-Dimethyl[1,1'-Biphenyl]-4,4'-Diyl]Bis[Azo(2,4-Dihydroxy-3,1-Phenylene)Azo]]Bis[Benzenesulfonic Acid Sodium] Salt is a high-purity, water-soluble disazo dye intermediate known for its excellent chromophore properties and stability. This compound is critical for synthesizing high-performance dyes and pigments that require strong color fastness and resistance to environmental factors. It is primarily utilized by manufacturers in the textile, ink, and specialty coatings industries seeking to produce vibrant and durable colors.

Application

• Textile Dyeing: As a key intermediate for producing high-grade, wash-fast azo dyes for synthetic and natural fibers.
• Ink Manufacturing: For formulating high-quality printing inks, including those for packaging and security applications.
• Industrial Pigments: In the synthesis of organic pigments used in plastics, paints, and coatings.
• Leather Coloring: As a precursor for dyes used in the leather tanning and finishing industry.
• Paper Coloring: For the production of dyes used in specialty paper and cardboard.
• Research & Development: As a standard or reagent in chemical research for developing new colorants and functional materials.

Basic Information

Product Name	4,4'-[[3,3'-Dimethyl[1,1'-Biphenyl]-4,4'-Diyl]Bis[Azo(2,4-Dihydroxy-3,1-Phenylene)Azo]]Bis[Benzenesulfonic Acid Sodium] Salt
CAS No.	6428-29-1
Molecular Formula	C40H28N8O10S2Na2
Molecular Weight	882.80 g/mol
Synonyms	Direct Brown 1; C.I. 30045; Benzenesulfonic acid, 4,4'-[[3,3'-dimethyl[1,1'-biphenyl]-4,4'-diyl]bis[azo(2,4-dihydroxy-3,1-phenylene)azo]]bis-, disodium salt; Disodium 4,4'-[[3,3'-dimethyl-4,4'-biphenylylene]bis[azo(2,4-dihydroxy-3,1-phenylene)azo]]dibenzenesulphonate; Azo Dye Intermediate Brown; C.I. Direct Brown 1
EINECS	229-178-3

Quality Control

Our 4,4'-[[3,3'-Dimethyl[1,1'-Biphenyl]-4,4'-Diyl]Bis[Azo(2,4-Dihydroxy-3,1-Phenylene)Azo]]Bis[Benzenesulfonic Acid Sodium] Salt is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure it meets exacting specifications for dye intermediate applications. A comprehensive Certificate of Analysis (COA) detailing purity, impurity profile, and physical properties is provided with each shipment to guarantee traceability and consistency.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). This product is hygroscopic (moisture-sensitive) and light-sensitive; prolonged exposure to air, moisture, or direct light should be avoided to maintain stability and performance.

Specification

Item	Specification
Appearance	Brown to dark brown 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.