Description

Fast Red B Salt is a high-purity diazonium salt primarily used as a coupling component in the synthesis of azo dyes and pigments. This compound is valued for its ability to produce vibrant, lightfast red and scarlet hues in various industrial applications. It is an essential intermediate for manufacturers in the textile, ink, and specialty coatings industries seeking consistent color performance and batch-to-batch reliability.

Application

• Azo Dye & Pigment Synthesis: A key coupling agent for producing high-performance red and scarlet azo dyes and organic pigments.
• Textile Dyeing & Printing: Used in the manufacture of dyes for coloring natural and synthetic fibers, including cotton, wool, and nylon.
• Ink Manufacturing: Imparts strong, vivid colorants for printing inks used in packaging, publications, and security printing.
• Specialty Coatings & Paints: Serves as a colorant intermediate for industrial paints, lacquers, and surface coatings requiring durable coloration.
• Biological Staining: Employed in histology and cytology as a diazonium salt for specific staining applications in diagnostic laboratories.
• Plastics & Polymers: Used to color masterbatches and compounded polymers for consistent pigmentation.

Basic Information

Product Name	Fast Red B Salt
CAS No.	49735-71-9
Molecular Formula	C17H13ClN4O4Zn
Molecular Weight	458.15 g/mol
Synonyms	Fast Red B Base; Fast Red B Salt Zinc Double Salt; 5-Chloro-2-methoxy-4-((4-nitrophenyl)azo)benzenediazonium Zinc Chloride; C.I. 37125; Diazo Fast Red B; Red B Salt; Azoic Diazo Component 5; Fast Red Salt B
EINECS	256-476-5

Quality Control

Our Fast Red B Salt is manufactured under strict quality management systems to ensure high purity and performance consistency. Each batch is tested against stringent in-house specifications, which typically include assay, identification, and impurity profile analysis. A Certificate of Analysis (COA) detailing all test results is provided with every shipment to guarantee compliance with your technical requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive) and light-sensitive; therefore, containers must be kept tightly sealed and away from direct light and moisture sources to maintain stability and prevent decomposition.

Specification

Item	Specification
Appearance	Yellow to orange-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility Test	Clear solution in specified solvent

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