Description

7-Hydroxy-8-[[4'-[[1-Hydroxy-6-(Phenylamino)-3-Sulfo-2-Naphtyl]Azo]-1,1'-Biphenyl-4-Yl]Azo]-1,3-Naphthalenedisulfonic Acid Trisodium Salt is a high-purity, water-soluble azo dye intermediate of significant industrial importance. This compound is valued for its ability to impart strong, stable coloration and its role as a key precursor in synthesizing complex dyes and pigments. It is primarily required by manufacturers in the textile, ink, and specialty chemical industries for producing high-performance colorants.

Application

• Primary Intermediate for Azo Dyes: A critical building block in the synthesis of high-grade, polyazo direct and reactive dyes for cotton and cellulose fibers.
• Textile Dyeing and Printing: Used in formulations for dyes that offer excellent wash and light fastness on textiles.
• Ink Manufacturing: Serves as a key component in the production of pigments for inks used in packaging, publishing, and specialty printing.
• Paper Coloring: Employed in the manufacture of dyes for coloring paper and paperboard products.
• Leather Dyeing: Used in dye formulations for achieving deep, uniform colors on leather goods.
• Research & Development: Acts as a standard or starting material in chemical research for developing new chromophores and functional dyes.
• Specialty Chemical Synthesis: Utilized as an intermediate for creating complex molecules with specific optical or electronic properties.

Basic Information

Product Name	7-Hydroxy-8-[[4'-[[1-Hydroxy-6-(Phenylamino)-3-Sulfo-2-Naphtyl]Azo]-1,1'-Biphenyl-4-Yl]Azo]-1,3-Naphthalenedisulfonic Acid Trisodium Salt
CAS No.	6507-84-2
Molecular Formula	C40H25N5O11S3Na3
Molecular Weight	924.81 g/mol
Synonyms	Direct Red 81; C.I. 28160; 7-Hydroxy-8-((4'-((1-hydroxy-6-(phenylamino)-3-sulfo-2-naphthyl)azo)(1,1'-biphenyl)-4-yl)azo)-1,3-naphthalenedisulfonic acid trisodium salt; Trisodium 7-hydroxy-8-[[4'-[[1-hydroxy-6-(phenylamino)-3-sulphonato-2-naphthyl]azo]-4-biphenylyl]azo]naphthalene-1,3-disulphonate; Benzo Fast Scarlet 4BS; Pontamine Fast Scarlet 4B; Azo Rubine S; Atlantic Resin Fast Scarlet 4BS
EINECS	229-409-2

Quality Control

Our production of 7-Hydroxy-8-[[4'-[[1-Hydroxy-6-(Phenylamino)-3-Sulfo-2-Naphtyl]Azo]-1,1'-Biphenyl-4-Yl]Azo]-1,3-Naphthalenedisulfonic Acid Trisodium Salt adheres to stringent quality management protocols. Each batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure consistent performance and batch-to-batch reliability. A detailed Certificate of Analysis (COA) documenting purity, impurity profile, and physical specifications is provided with every 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 nature, the container must be kept tightly sealed after opening to prevent moisture absorption, which can affect product stability and handling properties.

Specification

Item	Specification
Appearance	Dark red to brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Water Content	≤ 5.0%
pH (1% Solution)	6.0 - 8.0
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.