Description

2,7-Naphthalenedisulfonic acid, 3-[[4-[2-[4-[[8-(acetylamino)-1-hydroxy-3,6-disulfo-2-naphthalenyl]azo]-2-sulfophenyl]ethenyl]-3-sulfophenyl]azo]-5-amino-4-hydroxy-6-[(4-sulfophenyl)azo]-, heptasodium salt is a high-purity, complex synthetic dye intermediate belonging to the azo-naphthalene sulfonate class. This compound is valued for its ability to impart intense and stable coloration in demanding industrial applications. It is primarily utilized by manufacturers in the textile, specialty ink, and advanced materials sectors seeking consistent and reliable chromophores.

Application

• Textile Dyeing: As a key intermediate for producing high-performance, wash-fast, and light-fast dyes for synthetic fibers like nylon and polyamide.
• Ink Manufacturing: Used in the formulation of specialty inks, including those for security printing, digital textile printing, and high-quality packaging.
• Paper Coloration: Employed in the production of specialty colored papers where high color strength and stability are required.
• Leather Finishing: Acts as a dye component for achieving deep, uniform shades on leather goods.
• Biological Staining: Potential use as a specialized stain or marker in histological and cytological applications due to its chromophoric structure.
• Functional Materials Research: Serves as a building block in research for developing organic semiconductors, sensors, or photonic materials.

Basic Information

Product Name	2,7-Naphthalenedisulfonic acid, 3-[[4-[2-[4-[[8-(acetylamino)-1-hydroxy-3,6-disulfo-2-naphthalenyl]azo]-2-sulfophenyl]ethenyl]-3-sulfophenyl]azo]-5-amino-4-hydroxy-6-[(4-sulfophenyl)azo]-, heptasodium salt
CAS No.	85118-36-1
Molecular Formula	C44H26N7Na7O23S7 (or related sodium salt form)
Molecular Weight	Contact for details
Synonyms	Acid Black 210 (C.I. 300317); Heptasodium 5-amino-3-[[4-[2-[4-[(8-acetamido-1-hydroxy-3,6-disulphonato-2-naphthyl)azo]-2-sulphophenyl]vinyl]-3-sulphophenyl]azo]-4-hydroxy-6-(4-sulphophenyl)azo-2,7-naphthalenedisulphonate; C.I. Acid Black 210; Black 210; Azo Black 210; Reactive Black 210 (related class); Heptasodium salt of a complex azo dye.
EINECS	Contact for details

Quality Control

Our production of this dye intermediate adheres to stringent quality control protocols to ensure batch-to-batch consistency and performance reliability. Quality is verified through comprehensive analytical testing, including HPLC for purity and spectrophotometry for color strength. A detailed Certificate of Analysis (COA) specifying purity, impurity profile, and physical specifications 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 a controlled room temperature (15-25°C). This material is hygroscopic (moisture-sensitive); ensure the container is kept tightly sealed to prevent absorption of atmospheric moisture, which can affect product performance and handling.

Specification

Item	Specification
Appearance	Dark blue to black powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	Min. 95%
Color Strength	100% ± 5% (vs. Standard)
Moisture Content	Max. 5.0%
Water Solubility	Completely soluble
Heavy Metals (as Pb)	Max. 20 ppm
Sulfated Ash	Contact for details

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