Description

Fast Red KL Salt is a high-purity diazonium salt primarily used as a coupling component in the synthesis of azo dyes and pigments. Its primary value lies in producing vibrant, lightfast red and scarlet shades with excellent application properties. This intermediate is essential for manufacturers in the textile, leather, paper, and specialty ink industries seeking consistent color performance and batch-to-batch reliability.

Application

• Primary coupling agent for the production of azo-based red and scarlet dyes.
• Key intermediate in the coloration of natural and synthetic fibers for textiles.
• Manufacture of pigments and colorants for leather finishing and paper coating.
• Used in the formulation of specialty inks, including inks for packaging and security printing.
• Research and development of novel colorants in academic and industrial laboratories.
• Potential use as a biochemical stain or reagent in histological applications (subject to specific grade availability).

Basic Information

Product Name	Fast Red KL Salt
CAS No.	86780-25-8
Molecular Formula	C14H12ClN3O3S
Molecular Weight	337.78 g/mol
Synonyms	Fast Red KL Base; 5-Chloro-2-methoxy-4-((4-sulfophenyl)azo)benzenediazonium Salt; 2-Methoxy-5-chloro-4'-sulfobenzeneazobenzenediazonium Salt; C.I. 37190; Azoic Diazo Component 42; Fast Red K.L. Salt; 4-((4-Chloro-2-methoxyphenyl)azo)benzenesulfonic acid diazonium salt
EINECS	Contact for details

Quality Control

Our Fast Red KL Salt is manufactured under a stringent quality management system. Every batch is tested to ensure high purity, consistent coupling strength, and optimal performance in final applications. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and physical specifications is provided with each shipment to guarantee traceability and compliance with your technical requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at a controlled room temperature (15-25°C). Keep away from heat, sparks, and open flame. Due to its nature as a diazonium salt, it should be stored separately from strong bases and reducing agents.

Specification

Item	Specification
Appearance	Yellow to light brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Water Content	≤ 2.0%
Insoluble Matter	≤ 0.5%
Coupling Value	Contact for details

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