Description

Trisodium 4,5-Dihydro-4-[[4-(6-Methyl[2,6'-Bibenzothiazol]-2'-Yl)-2-Sulphonatophenyl]Azo]-5-Oxo-1-(4-Sulphonatophenyl)-1H-Pyrazole-3-Carboxylate is a high-purity, water-soluble anionic dye belonging to the benzothiazole azo pyrazole chemical class. This compound is engineered to deliver exceptional color strength and stability in demanding industrial environments. It is primarily required by manufacturers in the textile, specialty ink, and advanced material coating sectors seeking reliable and consistent colorants for high-performance applications.

Application

• Textile Dyeing: Primary application for dyeing natural and synthetic fibers, particularly where bright, wash-fast shades are required.
• Inkjet Inks: Used in the formulation of high-quality pigment and dye-based inks for commercial and industrial printing.
• Functional Coatings: Imparts color to coatings for plastics, metals, and other substrates where lightfastness is critical.
• Paper Coloring: Suitable for specialty paper grades requiring vibrant and uniform coloration.
• Leather Finishing: Applied in dyeing processes for leather goods to achieve deep, penetrating colors.
• Research & Development: Serves as a key intermediate or reference standard in chemical synthesis and analytical laboratories.

Basic Information

Product Name	Trisodium 4,5-Dihydro-4-[[4-(6-Methyl[2,6'-Bibenzothiazol]-2'-Yl)-2-Sulphonatophenyl]Azo]-5-Oxo-1-(4-Sulphonatophenyl)-1H-Pyrazole-3-Carboxylate
CAS No.	85631-91-0
Molecular Formula	C34H19N6Na3O10S3
Molecular Weight	844.77 g/mol (approx.)
Synonyms	Reactive Black 5 (related class); C.I. 20505; Trisodium 1-(4-sulfophenyl)-4-[[4-(6-methyl-2-benzothiazolyl)phenyl]azo]-5-oxo-4,5-dihydro-1H-pyrazole-3-carboxylate; Azo Benzothiazole Dye; 4,5-Dihydro-4-[[4-(6-methyl-2-benzothiazolyl)phenyl]azo]-5-oxo-1-(4-sulfophenyl)-1H-pyrazole-3-carboxylic acid trisodium salt; 6-Methyl-2-[4-[(4,5-dihydro-5-oxo-1-(4-sulfophenyl)-1H-pyrazol-4-yl)azo]phenyl]benzothiazole trisodium salt.
EINECS	Contact for details

Quality Control

Our production of this dye adheres to stringent quality control protocols to ensure batch-to-batch consistency and performance reliability. Every lot is analyzed for critical parameters including purity, color value, and impurity profile. Certificates of Analysis (COA) documenting these 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 (moisture-sensitive) nature, the container must be kept tightly sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Dark powder or granules
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Water Solubility	Completely soluble
Ash Content	Contact for details
Heavy Metals (as Pb)	< 20 ppm

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