Description

Disodium 3-[(2-chloro-4-nitrophenyl)azo]-4-hydroxy-7-[[2-hydroxy-4-[[3-hydroxy-4-[[4-[(4-nitro-2-sulphonatophenyl)amino]phenyl]azo]phenyl]amino]phenyl]azo]naphthalene-2-sulphonate is a high-performance, water-soluble azo dye complex valued for its strong color strength and stability. This compound is engineered to deliver consistent, vibrant coloration in demanding industrial applications where lightfastness and washfastness are critical. It is primarily utilized by manufacturers in the textile, leather, and specialty ink industries seeking reliable and efficient dyeing agents.

Application

• Textile Dyeing: Primary application for dyeing natural and synthetic fibers, including cotton, wool, and nylon, offering excellent color yield.
• Leather Finishing: Used in the coloration of leather goods, providing deep, uniform shades with good adhesion.
• Ink Manufacturing: A key pigment for producing industrial inks, including those for packaging and specialty printing.
• Paper Coloring: Employed in the production of colored papers and paper products requiring specific hue stability.
• Biological Staining: Potential use as a histological stain in laboratory settings due to its chromophoric properties.
• Plastics and Polymers: Can be incorporated for coloring certain types of plastics and polymeric materials.

Basic Information

Product Name	Disodium 3-[(2-chloro-4-nitrophenyl)azo]-4-hydroxy-7-[[2-hydroxy-4-[[3-hydroxy-4-[[4-[(4-nitro-2-sulphonatophenyl)amino]phenyl]azo]phenyl]amino]phenyl]azo]naphthalene-2-sulphonate
CAS No.	85391-43-1
Molecular Formula	C40H24ClN9Na2O14S2
Molecular Weight	1040.30 g/mol
Synonyms	Reactive Black 5; Remazol Black B; C.I. Reactive Black 5; Disodium 4-amino-5-hydroxy-3-[[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]azo]-6-(phenylazo)-2,7-naphthalenedisulfonate (related isomer); C.I. 20505; Levafix Black E-B; Sumifix Black B; Dianix Black BG-FS; Procion Black H-EXL
EINECS	Contact for details

Quality Control

Our production of disodium 3-[(2-chloro-4-nitrophenyl)azo]-4-hydroxy-7-[[2-hydroxy-4-[[3-hydroxy-4-[[4-[(4-nitro-2-sulphonatophenyl)amino]phenyl]azo]phenyl]amino]phenyl]azo]naphthalene-2-sulphonate adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance. Every lot is analyzed against key specifications for color strength, purity, 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 sealed to prevent absorption of atmospheric moisture, which can affect product performance and handling.

Specification

Item	Specification
Appearance	Dark blue to black powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 95.0%
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Solubility	Completely soluble
pH (1% Solution)	6.0 - 8.0
Heavy Metals (as Pb)	≤ 20 ppm

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