Description

1,7-Naphthalenedisulfonic Acid, 5-Hydroxy-4-[[(6-Hydroxy- 2-Naphthalenyl)Sulfonyl]Amino]-, Coupled With Diazotized Aniline, o-And p-Toluidine, Sodium Salts is a complex, water-soluble azo dye intermediate of significant commercial importance. This compound is valued for its ability to impart vibrant and stable color properties in demanding industrial applications. It is primarily sought after by manufacturers in the textile, leather, and specialty paper industries for the production of high-performance dyes and pigments.

Application

• Primary Dye Intermediate: A key precursor in the synthesis of acid dyes and direct dyes for coloring nylon, wool, silk, and leather.
• Textile Industry: Used in dye formulations for achieving deep, wash-fast shades on polyamide and protein-based fibers.
• Leather Finishing: Employed in dye baths for leather goods, providing uniform coloration with good penetration.
• Paper Coloring: Suitable for the tinting of specialty papers where color fastness is required.
• Ink Formulation: A component in the manufacture of certain industrial inks requiring specific hue and solubility characteristics.
• Research & Development: Serves as a standard or building block in chemical research for developing new chromophores and functional dyes.

Basic Information

Item	Details
Product Name	1,7-Naphthalenedisulfonic Acid, 5-Hydroxy-4-[[(6-Hydroxy- 2-Naphthalenyl)Sulfonyl]Amino]-, Coupled With Diazotized Aniline, o-And p-Toluidine, Sodium Salts
CAS No.	73070-41-4
Molecular Formula	Contact for details
Molecular Weight	Contact for details
Synonyms	Acid Black 210; C.I. 28440; 1,7-Naphthalenedisulfonic acid, 5-hydroxy-4-[[(6-hydroxy-2-naphthalenyl)sulfonyl]amino]-, coupled with diazotized aniline, o- and p-toluidine, sodium salts; Black 210 (Acid); Acid Black 210, sodium salt; Azo dye intermediate for Acid Black 210; Sodium 5-hydroxy-4-[(6-hydroxy-2-naphthyl)sulfamoyl]-1,7-naphthalenedisulphonate coupled with diazotized aniline and toluidines
EINECS	Contact for details

Quality Control

Our production of this dye intermediate adheres to strict quality management systems to ensure batch-to-batch consistency and performance. Quality is verified through comprehensive analytical testing, including chromatographic purity analysis and strength assessment. A Certificate of Analysis (COA) detailing key specifications such as purity, hue, and solubility is provided with every shipment to guarantee it meets your formulation requirements.

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). This material is hygroscopic (moisture-sensitive); keep the original container tightly sealed to minimize exposure to atmospheric humidity.

Specification

Item	Specification
Appearance	Dark powder or granules
Identification (IR)	Conforms to structure
Assay (HPLC)	Min. 90%
Moisture Content	Max. 5.0%
Solubility (in Water)	Clear solution at 1%
Ash Content	Contact for details
Heavy Metals (as Pb)	Contact for details

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