Description

Fast Red Tr Salt 1,5-Naphthalenedisulfonate Salt is a specialized 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 vibrant, lightfast red and scarlet hues with excellent substrate adhesion. It is an essential intermediate for manufacturers in the textile, ink, and specialty coatings industries seeking high-performance colorants. The product is supplied as a stabilized salt for safe handling and consistent reactivity.

Application

• Azo Dye & Pigment Synthesis: A key coupling component for producing high-quality red azo dyes and organic pigments.
• Textile Dyeing & Printing: Used in the formulation of dyes for coloring natural and synthetic fibers, including cotton and nylon.
• Ink Manufacturing: Imparts intense color for printing inks used in packaging, publications, and security printing.
• Coatings and Paints: Serves as a colorant intermediate in industrial and automotive coatings requiring durability.
• Biological Staining: Employed in histology and cytology as a diazonium salt for specific tissue staining applications.
• Research & Development: Used as a chemical intermediate in organic synthesis and material science research.

Basic Information

Product Name	Fast Red Tr Salt 1,5-Naphthalenedisulfonate Salt
CAS No.	51503-28-7
Molecular Formula	C16H14N4O6S2
Molecular Weight	422.43 g/mol
Synonyms	Fast Red TR Salt; 4-Chloro-2-methylbenzenediazonium 1,5-naphthalenedisulfonate; Fast Red TR Diazo Salt; Diazo Fast Red TR; C.I. 37135; Azoic Diazo Component 11; 2-Methyl-4-chlorobenzenediazonium naphthalene-1,5-disulfonate
EINECS	257-237-6

Quality Control

Our Fast Red Tr Salt is manufactured under strict quality control protocols to ensure batch-to-batch consistency and high reactivity. The product is tested against stringent in-house specifications for purity, assay, and impurity profiles. A comprehensive Certificate of Analysis (COA) detailing results for identity (IR), assay (titration), and related substances is provided with each shipment to support your quality assurance processes.

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; prolonged exposure to air, moisture, or direct light should be avoided to maintain stability and performance. Keep away from heat sources and incompatible materials.

Specification

Item	Specification
Appearance	Light beige to tan powder
Identification (IR)	Conforms to structure
Assay (Titration)	≥ 98.0 %
Water Content (KF)	≤ 2.0 %
Solubility	Soluble in water

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