Description

Trisodium 4-Hydroxy-3-[[4'-[(1-Hydroxy-4-Sulphonato-2-Naphthyl)Azo]-3,3'-Dimethoxy[1,1'-Biphenyl]-4-Yl]Azo]Naphthalene-2,7-Disulphonate is a high-purity, water-soluble azo dye intermediate of significant industrial importance. Its complex polyazo structure provides excellent chromophoric properties, making it a critical precursor for synthesizing vibrant and stable dyes and pigments. This compound is essential for manufacturers in the textile, ink, and specialty coatings industries seeking to produce high-performance colorants with specific fastness and solubility profiles.

Application

• Primary Intermediate for Reactive Dyes: A key building block in the synthesis of high-quality reactive dyes for cotton and other cellulosic fibers, offering excellent wash and light fastness.
• Pigment Manufacturing: Used in the production of high-performance organic pigments for industrial paints, plastics, and printing inks, providing intense color strength.
• Textile Dyeing: Serves as a crucial component in the formulation of dyes for wool, silk, and nylon, ensuring deep, uniform shades.
• Laser and Inkjet Ink Formulations: Its solubility and color properties make it suitable for advanced digital printing applications requiring precise color gamuts.
• Biological Staining: Potential use as a staining agent in histology and microscopy due to its specific affinity and color properties.
• Research & Development: Employed in chemical research for developing novel chromophores and studying azo dye chemistry and photostability.

Basic Information

Product Name	Trisodium 4-Hydroxy-3-[[4'-[(1-Hydroxy-4-Sulphonato-2-Naphthyl)Azo]-3,3'-Dimethoxy[1,1'-Biphenyl]-4-Yl]Azo]Naphthalene-2,7-Disulphonate
CAS No.	6473-33-2
Molecular Formula	C40H24N4Na3O14S3
Molecular Weight	958.78 g/mol
Synonyms	Reactive Black 5 Intermediate; C.I. Reactive Black 5 (tetrasodium salt precursor); Trisodium 6-amino-4-hydroxy-3-[[7-sulfo-4-[(4-sulfophenyl)azo]-1-naphthyl]azo]-2-naphthalenesulfonate (related isomer); Polyazo Dye Intermediate; Azo Dye CAS 6473-33-2; Tetrasodium 4-Amino-5-hydroxy-3-[[4'-[(2-hydroxy-1-naphthalenyl)azo]-3,3'-dimethoxy[1,1'-biphenyl]-4-yl]azo]-2,7-naphthalenedisulfonate (alternative naming); 1,3-Naphthalenedisulfonic acid, 6-amino-4-hydroxy-3-[[4'-[(2-hydroxy-1-naphthalenyl)azo]-3,3'-dimethoxy[1,1'-biphenyl]-4-yl]azo]-, sodium salt (1:3)
EINECS	Contact for details

Quality Control

Our production of Trisodium 4-Hydroxy-3-[[4'-[(1-Hydroxy-4-Sulphonato-2-Naphthyl)Azo]-3,3'-Dimethoxy[1,1'-Biphenyl]-4-Yl]Azo]Naphthalene-2,7-Disulphonate adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing, including HPLC for purity, spectrophotometry for color strength, and tests for residual solvents and heavy metals to ensure it meets the exacting standards required for dye and pigment synthesis. Certificates of Analysis (COA) documenting purity, identity, and key physical-chemical parameters are provided with each shipment to guarantee traceability and consistency for our global B2B clients.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at a controlled room temperature (15-25°C). This material is hygroscopic (moisture-sensitive); the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect purity and performance. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Dark blue to black powder or granules
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0% (typical 97-99%)
Color Strength	≥ 98% of standard
Moisture Content	≤ 5.0%
Water Solubility	Completely soluble
Heavy Metals (as Pb)	≤ 20 ppm
Residual Solvents	Meets ICH guidelines

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