Description

Disodium Hydrogen 5-Amino-3-[[4'-[(7-Amino-1-Hydroxy-3-Sulphonato-2-Naphthyl)Azo][1,1'-Biphenyl]-4-Yl]Azo]-4-Hydroxynaphthalene-2,7-Disulphonate is a high-purity, water-soluble azo dye intermediate of significant industrial importance. Its complex, multi-sulfonated structure provides excellent substantivity and chromophore properties, making it a critical precursor for synthesizing high-value dyes and pigments. This compound is essential for manufacturers in the textile, ink, and specialty chemical industries seeking to produce vibrant, wash-fast colors.

Application

• Primary Intermediate for Reactive Dyes: Key building block for synthesizing high-performance reactive dyes used in cotton and cellulose fiber dyeing.
• Direct Dye Production: Used in the manufacture of direct dyes for paper, leather, and textile applications requiring good water solubility.
• Specialty Pigment Synthesis: Serves as a precursor for creating complex organic pigments with enhanced color strength and durability.
• Inkjet Ink Formulations: Employed in the production of colorants for high-quality digital textile and industrial inkjet printing.
• Biological Staining Reagents: Potential use in the synthesis of specialized stains for histological and cytological applications in laboratories.
• Research & Development: Used in chemical research for developing new chromophores and studying azo dye chemistry and properties.

Basic Information

Item	Detail
Product Name	Disodium Hydrogen 5-Amino-3-[[4'-[(7-Amino-1-Hydroxy-3-Sulphonato-2-Naphthyl)Azo][1,1'-Biphenyl]-4-Yl]Azo]-4-Hydroxynaphthalene-2,7-Disulphonate
CAS No.	68214-82-4
Molecular Formula	C32H21N6Na2O11S3
Molecular Weight	830.70 g/mol
Synonyms	Disodium 5-Amino-3-[[4'-[(7-amino-1-hydroxy-3-sulphonato-2-naphthyl)azo][1,1'-biphenyl]-4-yl]azo]-4-hydroxynaphthalene-2,7-disulphonate; C.I. Reactive Black 5 Intermediate; Azo Dye Intermediate Black 5; Tetrasodium 5-Amino-4-hydroxy-3-[[4'-[(7-amino-1-hydroxy-3-sulphonato-2-naphthyl)azo][1,1'-biphenyl]-4-yl]azo]naphthalene-2,7-disulphonate (related form); Reactive Black 5 Precursor; 68214-82-4 (CAS); Bis(7-amino-1-hydroxy-3,6-disulfo-2-naphthylazo)biphenyl derivative
EINECS	Contact for details

Quality Control

Our Disodium Hydrogen 5-Amino-3-[[4'-[(7-Amino-1-Hydroxy-3-Sulphonato-2-Naphthyl)Azo][1,1'-Biphenyl]-4-Yl]Azo]-4-Hydroxynaphthalene-2,7-Disulphonate is manufactured under strict quality management systems. Every batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise specifications for dye intermediate applications. Certificates of Analysis (COA) documenting batch-specific results are available upon request to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive); keep the container tightly sealed to prevent absorption of atmospheric moisture, which can affect performance and handling.

Specification

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

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