Description

Fast Red B Salt is a 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 materials. It is an essential intermediate for manufacturers in the textile, leather, ink, and specialty chemical industries seeking consistent color performance.

Application

• Textile Dyeing and Printing: A key intermediate for producing azo dyes applied to cotton, silk, and synthetic fibers.
• Leather Coloring: Used in the formulation of dyes for imparting durable red shades to leather goods.
• Ink Manufacturing: Employed in the synthesis of pigments for printing inks, including packaging and publication inks.
• Pigment Production: Serves as a coupling agent in the manufacture of organic pigments for plastics and coatings.
• Paper Staining: Utilized in the production of dyes for specialty paper and paperboard products.
• Biological Staining (Histology): Acts as a chromogen in specific diagnostic and histological staining kits.

Basic Information

Product Name	Fast Red B Salt
CAS No.	56315-29-8
Molecular Formula	C17H13ClN4O4S
Molecular Weight	404.82 g/mol
Synonyms	Fast Red B Base; 5-Chloro-2-methoxy-4-(methylsulfonamido)benzenediazonium Chloride; 4-Amino-5-chloro-2-methoxy-N-methylbenzenesulfonamide Diazonium Salt; Azoic Diazo Component 5; C.I. 37125; Diazo Fast Red B; Red B Salt
EINECS	Contact for details

Quality Control

Our Fast Red B Salt is manufactured under strict process controls to ensure batch-to-batch consistency and high purity. Quality is verified through a comprehensive suite of analytical tests including HPLC, IR spectroscopy, and titration methods. A Certificate of Analysis (COA) detailing purity, assay, and impurity profiles is provided with each shipment to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after opening to prevent degradation from atmospheric moisture.

Specification

Item	Specification
Appearance	Light beige to tan powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility	Soluble in polar organic solvents

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