Description

2,7-Naphthalenedisulfonic acid, 5-amino-4-hydroxy-3-[[4'- [(1-hydroxy-4-sulfo-2-naphthalenyl)azo]-3,3'-dimethoxy [1,1'-biphenyl]-4-yl]azo]-, monolithium disodium salt is a high-purity, complex azo dye intermediate essential for producing vibrant and stable colorants. Its multi-sulfonated, lithiated structure provides excellent water solubility and chromophore stability, making it a critical component for demanding applications. This compound is primarily required by manufacturers in the textile, ink, and specialty pigment industries seeking to formulate high-performance dyes with superior fastness properties.

Application

• Primary Intermediate for Reactive Dyes: A key building block in the synthesis of high-grade reactive dyes for cotton and cellulose fiber dyeing and printing.
• Textile Colorant Production: Used in manufacturing direct and acid dyes for wool, silk, and nylon, offering bright shades and good wash fastness.
• Inkjet Ink Formulations: Employed in the production of specialized pigments and dyes for high-quality industrial and graphic arts inks, ensuring color intensity and durability.
• Specialty Pigments and Lakes: Serves as a precursor for creating complex pigments and lakes used in plastics, coatings, and security inks.
• Biological Staining Reagents: Potential use in the synthesis of histological stains for microscopy and diagnostic applications in life sciences.
• Research & Development: A valuable chemical for R&D laboratories focusing on novel chromophores, dye chemistry, and material science.

Basic Information

Item	Details
Product Name	2,7-Naphthalenedisulfonic acid, 5-amino-4-hydroxy-3-[[4'- [(1-hydroxy-4-sulfo-2-naphthalenyl)azo]-3,3'-dimethoxy [1,1'-biphenyl]-4-yl]azo]-, monolithium disodium salt
CAS No.	75673-18-6
Molecular Formula	C34H23LiN5Na2O14S3
Molecular Weight	~899.79 g/mol (Contact for exact details)
Synonyms	C.I. Reactive Black 5 (Lithium Sodium Salt); Reactive Black 5 Li/Na Salt; Monolithium Disodium Salt of Reactive Black 5; 5-Amino-4-hydroxy-3-((4'-((1-hydroxy-4-sulfo-2-naphthyl)azo)-3,3'-dimethoxybiphenyl-4-yl)azo)-2,7-naphthalenedisulfonic Acid Monolithium Disodium Salt; C.I. 20505; Lanasol Black B (related); Remazol Black B (related salt form)
EINECS	Contact for details

Quality Control

Our production of this advanced dye intermediate adheres to strict quality management systems. Every batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise customer specifications and industry standards. A detailed Certificate of Analysis (COA) documenting purity, impurity profile, and physical properties is provided with each shipment to guarantee traceability and consistency for your manufacturing processes.

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) and light-sensitive; containers must be kept sealed to prevent absorption of moisture and degradation.

Specification

Item	Specification
Appearance	Dark blue to black powder or granules
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 90% (Typical 92-95%)
Moisture Content (KF)	≤ 5.0%
Water Solubility	Freely soluble
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Individual impurity ≤ 1.0%; Total impurities ≤ 5.0%

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