Description

7-[4,5-Dihydro-4-[(2-Hydroxy-3-Nitro-5-Sulphophenyl)Azo]-3-Methyl-5-Oxo-1H-Pyrazol-1-Yl]-4-Hydroxynaphthalene-2-Sulphonic Acid is a high-purity, complex azo dye intermediate essential for synthesizing vibrant and stable colorants. This compound matters for its role in producing specialized dyes with excellent light and wash fastness properties, meeting stringent industrial quality demands. It is primarily needed by manufacturers in the textile, ink, and specialty chemical sectors seeking reliable intermediates for high-performance dye production.

Application

• Primary Intermediate for Reactive Dyes: Key building block for synthesizing high-quality reactive dyes used in cotton and cellulose fiber dyeing.
• Textile Colorant Production: Manufacture of dyes for wool, silk, and nylon, offering a range of yellow to orange hues.
• Inkjet and Printing Inks: Used in the formulation of specialized inks requiring high color strength and stability.
• Leather Dyeing: Production of dyes for the leather tanning and finishing industry.
• Paper Coloring: Intermediate for dyes used in high-grade paper and packaging materials.
• Research & Development: Serves as a critical reagent in chemical R&D for developing novel chromophores and functional dyes.

Basic Information

Product Name	7-[4,5-Dihydro-4-[(2-Hydroxy-3-Nitro-5-Sulphophenyl)Azo]-3-Methyl-5-Oxo-1H-Pyrazol-1-Yl]-4-Hydroxynaphthalene-2-Sulphonic Acid
CAS No.	85136-00-1
Molecular Formula	C20H15N5O11S2
Molecular Weight	565.49 g/mol
Synonyms	Acid Orange 116 (related dye class); 4-Hydroxy-3-[(1-(4-hydroxy-7-sulfo-2-naphthyl)-3-methyl-5-oxo-1,5-dihydro-4H-pyrazol-4-ylidene]hydrazinyl]-5-nitrobenzenesulfonic acid; 7-[4,5-Dihydro-4-[(2-hydroxy-3-nitro-5-sulfophenyl)azo]-3-methyl-5-oxo-1H-pyrazol-1-yl]-4-hydroxy-2-naphthalenesulfonic acid; Azo dye intermediate 85136-00-1; CI 26410 (Precursor); Pyrazolone-based azo dye intermediate; Reactive Orange dye intermediate
EINECS	Contact for details

Quality Control

Our production of this azo dye intermediate adheres to rigorous quality testing protocols to ensure batch-to-batch consistency and high purity. Each lot is analyzed to confirm identity, strength, and impurity profiles, with Certificates of Analysis (COA) available upon request. We support compliance with relevant industry standards for dye intermediates.

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 sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Orange to brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Total impurities ≤ 3.0%

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