Description

Fast Red B Salt, 1,5-Naphthalenedisulfonate is a high-purity diazonium salt primarily used as a coupling agent in the synthesis of azo dyes and pigments. This compound is valued for its ability to produce vivid, lightfast red and scarlet shades in various industrial applications. It is an essential intermediate for manufacturers in the textile, ink, and specialty chemical sectors seeking consistent color development and batch-to-batch reliability.

Application

• Azo Dye & Pigment Synthesis: A key coupling component for producing high-performance red azo dyes and organic pigments.
• Textile Dyeing: Used in the manufacturing of dyes for coloring natural and synthetic fibers, including cotton and nylon.
• Ink Formulation: Employed in the production of printing inks for packaging, publications, and specialty printing.
• Leather Finishing: Utilized in dyes for leather goods to achieve durable and vibrant red colors.
• Paper Coloring: Applied in the manufacture of dyes for tinting paper and paperboard products.
• Biological Staining: Serves as a diazonium salt in histology for specific staining techniques.
• Chemical Research: Used as a reagent in organic synthesis and analytical chemistry applications.

Basic Information

Product Name	Fast Red B Salt, 1,5-Naphthalenedisulfonate
CAS No.	61925-55-1
Molecular Formula	C16H12N2O6S2
Molecular Weight	392.41 g/mol
Synonyms	Fast Red B Salt; 4-Nitro-2-aminophenol Diazonium Salt, 1,5-Naphthalenedisulfonate; 2-Amino-4-nitrophenol Diazonium Salt, 1,5-Naphthalenedisulfonate; Fast Red B Base Salt; C.I. 37125; Diazo Fast Red B; 1,5-Naphthalenedisulfonic Acid, Compd. with 2-Amino-4-nitrophenol Diazonium Salt; Fast Red B
EINECS	Contact for details

Quality Control

Our Fast Red B Salt is manufactured under strict quality protocols to ensure high purity and performance consistency for industrial applications. Each batch is tested against rigorous internal specifications, with key parameters including assay, impurity profile, and color strength. A Certificate of Analysis (COA) documenting these 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 area at a controlled room temperature (15-25°C). Due to its hygroscopic nature, the container must be kept tightly sealed to prevent moisture absorption, which can affect product stability and performance. Keep away from heat sources and incompatible materials.

Specification

Item	Specification
Appearance	Yellow to orange-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Solubility	Soluble in water
Heavy Metals	≤ 20 ppm

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