Description

p-[4-[[4-[[4-[[4,5-dihydro-3-methyl-5-oxo-1-(4-sulphophenyl)-1H-pyrazol-4-yl]azo]benzoyl]amino]phenyl]azo]-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl]benzenesulphonic acid is a high-purity, complex azo dye intermediate with a symmetrical bis-pyrazolone structure. This compound is valued for its ability to impart vivid and stable color properties, making it a critical precursor in the synthesis of high-performance dyes and pigments. It is primarily sought after by manufacturers in the textile, ink, and specialty coatings industries who require consistent quality and reliable supply for their production processes.

Application

• Textile Dye Synthesis: A key intermediate for producing reactive and acid dyes for coloring nylon, wool, and silk fibers.
• Ink Manufacturing: Used in the formulation of high-quality printing inks, including those for packaging and security applications.
• Pigment Production: Serves as a precursor for creating organic pigments with excellent lightfastness and thermal stability.
• Leather Dyeing: Employed in the synthesis of dyes for the leather tanning and finishing industry.
• Paper Coloring: Used in the manufacture of dyes for specialty and decorative papers.
• Research & Development: A valuable chemical for R&D laboratories exploring new chromophores and functional dyes.

Basic Information

Product Name	p-[4-[[4-[[4-[[4,5-dihydro-3-methyl-5-oxo-1-(4-sulphophenyl)-1H-pyrazol-4-yl]azo]benzoyl]amino]phenyl]azo]-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl]benzenesulphonic acid
CAS No.	56670-26-9
Molecular Formula	C34H26N8O10S2
Molecular Weight	770.75 g/mol
Synonyms	Acid Yellow 219 (C.I. 13951); 1,3-Benzenedisulfonic acid, 4,4'-[1,1'-biphenyl]-4,4'-diylbis(azo)]bis[4,5-dihydro-5-oxo-1-(4-sulfophenyl)-1H-pyrazole-3-carboxylic acid] derivative; Bis(1-(4-sulfophenyl)-3-methyl-5-pyrazolone) derivative azo dye intermediate; Symmetrical bis-pyrazolone azo compound; Yellow azo dye intermediate; 4,4'-Bis[[3-methyl-5-oxo-1-(4-sulfophenyl)-2-pyrazolin-4-yl]azo]biphenyl-4,4'-dicarboxylic acid derivative
EINECS	Contact for details

Quality Control

Our production of this dye intermediate adheres to rigorous quality control protocols to ensure batch-to-batch consistency and purity. Standard testing includes identification (IR), assay (HPLC), and control of key impurities. A Certificate of Analysis (COA) detailing purity, physical characteristics, and test results is provided with each shipment 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). Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	Yellow to Orange Powder
Identification (IR)	Conforms to Standard
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm

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