Description

4-[[4-[(4-Phenylamino-1-Naphthalenyl)Azo]-1-Naphthalenyl]Azo]Benzene-1,3-Disulfonic Acid Disodium Salt is a high-purity, water-soluble disazo dye intermediate with excellent tinctorial strength and chemical stability. This compound is critical for synthesizing specialized dyes and pigments that require high lightfastness and vibrant color properties. It is primarily needed by manufacturers in the textile, ink, and specialty polymer industries for producing high-performance colorants.

Application

• Textile Dye Intermediate: A key precursor for the synthesis of acid dyes and direct dyes used on wool, silk, and nylon fibers.
• Ink Manufacturing: Used in the production of high-quality printing inks, including those for packaging and security applications, due to its color intensity.
• Functional Pigment Synthesis: Serves as a building block for creating pigments with specific optical or electronic properties for advanced materials.
• Research & Development: Employed in academic and industrial R&D labs for developing novel chromophores and studying azo dye chemistry.
• Analytical Chemistry: Can be utilized as a staining agent or a colorimetric indicator in specific analytical methodologies.
• Specialty Polymer Colorant: Incorporated into the synthesis of colored polymers where the dye moiety is covalently bonded for superior migration resistance.

Basic Information

Product Name	4-[[4-[(4-Phenylamino-1-Naphthalenyl)Azo]-1-Naphthalenyl]Azo]Benzene-1,3-Disulfonic Acid Disodium Salt
CAS No.	6527-61-3
Molecular Formula	C38H24N6Na2O6S2
Molecular Weight	778.73 g/mol
Synonyms	Acid Black 131; C.I. 15711; Direct Black 131; 4-[[4-[(4-Anilinonaphthalen-1-yl)diazenyl]naphthalen-1-yl]diazenyl]benzene-1,3-disulfonic acid disodium salt; 1-Naphthalenesulfonic acid, 4-[[4-[(4-(phenylamino)-1-naphthalenyl)azo]-1-naphthalenyl]azo]-, disodium salt; Disodium 4-[[4-[(4-anilinonaphthalen-1-yl)diazenyl]naphthalen-1-yl]diazenyl]benzene-1,3-disulfonate; Benzenesulfonic acid, 4-[[4-[(4-(phenylamino)-1-naphthalenyl)azo]-1-naphthalenyl]azo]-1,3-di-, disodium salt
EINECS	229-426-3

Quality Control

Our production of 4-[[4-[(4-Phenylamino-1-Naphthalenyl)Azo]-1-Naphthalenyl]Azo]Benzene-1,3-Disulfonic Acid Disodium Salt adheres to stringent quality management protocols. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure consistent performance and compliance with customer specifications. A comprehensive Certificate of Analysis (COA) detailing all test results is provided with each shipment.

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 after each use to prevent absorption of atmospheric moisture, which can affect product quality.

Specification

Item	Specification
Appearance	Dark blue to black powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Water Content	≤ 5.0%
Sulfated Ash	≤ 20.0%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (in Water)	Freely soluble

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