Description

Fast Red KL Base is a high-purity diazonium salt intermediate, widely recognized for its critical role in the synthesis of azo pigments and dyes. Its primary value lies in providing a reliable and consistent coupling component, essential for producing vivid and stable red and orange colorants. This product is indispensable for manufacturers in the pigments, textile dyes, inks, and specialty coatings industries who require precise color development and batch-to-batch uniformity.

Application

• Primary coupling component for the synthesis of high-performance azo pigments.
• Key intermediate in the production of textile dyes, particularly for cotton and other cellulosic fibers.
• Used in formulating printing inks for packaging and publications requiring strong, lightfast red hues.
• Essential for manufacturing colorants for industrial coatings and plastics.
• Employed in the development of specialized dyes for paper coloration.
• Acts as a chemical precursor in research and development of novel organic colorants.

Basic Information

Product Name	Fast Red KL Base
CAS No.	12216-86-3
Molecular Formula	C17H13ClN2O4
Molecular Weight	344.75 g/mol
Synonyms	5-Chloro-2-toluidino-4-sulfobenzoic Acid; 5-Chloro-2-[(4-methylphenyl)amino]-4-sulfobenzoic Acid; Fast Red KL Base; Fast Red K.L. Base; C.I. Azoic Coupling Component 12; Azoic Coupling Component 12; C.I. 37520; 2-Amino-5-chloro-p-toluenesulfonic acid-4-carboxylic acid anilide
EINECS	Contact for details

Quality Control

Our Fast Red KL Base is manufactured under a stringent quality management system to ensure it meets the exacting standards of the colorant industry. Every batch undergoes comprehensive analytical testing, including assay, impurity profiling, and color strength evaluation. A Certificate of Analysis (COA) detailing all 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, and well-ventilated area at a controlled room temperature (15-25°C). Keep away from heat, open flames, and incompatible materials. Due to its light-sensitive nature, containers should be kept in the original packaging or opaque storage until use.

Specification

Item	Specification
Appearance	Off-white to light beige powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 1.0%
Sulfated Ash	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility	Partially soluble in alkaline water

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