Description

1H-Pyrazole-3-carboxylic acid, 4,5-dihydro-5-oxo-1-(4-sulfophenyl)-, coupled with diazotized 2'-(4-aminophenyl)-6-methyl[2,6'-bibenzothiazole]-7-sulfonic acid, diazotized 2''-(4-aminophenyl)-6-methyl[2,6':2',6''-terbenzothiazole]-7-sulfonic is a complex, high-value synthetic dye intermediate. This compound is engineered to deliver exceptional color strength and chromophore stability in demanding applications. It is primarily required by manufacturers in the specialty dyes and pigments industry, particularly for producing high-performance colorants for technical textiles and advanced materials.

Application

• Production of high-performance reactive and direct dyes for cotton and polyamide fibers.
• Key intermediate for black and deep shade dyes used in automotive and industrial textiles requiring superior lightfastness.
• Manufacturing of pigments for inks and coatings where color consistency is critical.
• Synthesis of specialized colorants for security printing and authentication applications.
• Research and development of novel chromophores with specific optical properties.
• Dyeing of technical fabrics including awnings, outdoor furniture, and military apparel.

Basic Information

Product Name	1H-Pyrazole-3-carboxylic acid, 4,5-dihydro-5-oxo-1-(4-sulfophenyl)-, coupled with diazotized 2'-(4-aminophenyl)-6-methyl[2,6'-bibenzothiazole]-7-sulfonic acid, diazotized 2''-(4-aminophenyl)-6-methyl[2,6':2',6''-terbenzothiazole]-7-sulfonic
CAS No.	90552-32-2
Molecular Formula	Contact for details
Molecular Weight	Contact for details
Synonyms	C.I. Reactive Black 31; Reactive Black 31; C.I. 90552-32-2; Black B-ED; 1H-Pyrazole-3-carboxylic acid, 4,5-dihydro-5-oxo-1-(4-sulfophenyl)-, coupled with diazotized 4-aminophenyl-6-methylbenzothiazole-2-sulfonic acid derivative; Reactive Dye Black 31; Complex polyazo reactive dye intermediate
EINECS	Contact for details

Quality Control

Our production of this advanced dye intermediate adheres to strict quality management systems to ensure batch-to-batch consistency and performance reliability. Every lot is analyzed to confirm critical parameters such as chromophore purity, sulfonation degree, and heavy metal content. A comprehensive Certificate of Analysis (COA) detailing identity, purity, and impurity profiles is provided with each shipment to support your quality assurance protocols.

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). Due to its hygroscopic nature, the container must be kept tightly sealed after opening to prevent moisture absorption, which can affect performance. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Dark powder or granules
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	Min. 90% (by area)
Moisture Content	Max. 5.0%
Ash Content	Max. 1.0%
Water Solubility	Complete solution in specified medium
Heavy Metals (as Pb)	Max. 20 ppm

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