Description

C.I. Basic Red 40 is a synthetic cationic dye belonging to the azo chemical class, identified by CAS No. 12221-64-6. This vibrant red colorant is valued for its strong affinity to polyacrylonitrile fibers and other substrates with anionic sites, delivering excellent color fastness and brightness. It is primarily required by manufacturers in the textile, paper, and specialty ink industries for dyeing and printing applications where a brilliant, durable red hue is essential.

Application

• Textile Dyeing: Primary application for dyeing acrylic, modacrylic, and certain polyester fibers, offering good wash and light fastness.
• Paper Coloring: Used in the production of colored papers, tissues, and paperboard where a strong red shade is required.
• Ink Formulation: Employed in the manufacture of specialty inks, including stamp pad inks and certain printing inks.
• Leather Finishing: Applied in the dyeing of leather goods to achieve consistent and vibrant red colors.
• Biological Staining: Utilized in histology and cytology as a staining agent for microscopic analysis in laboratory settings.
• Acrylic Yarn and Fabric Production: A key colorant for synthetic yarns and fabrics intended for apparel, upholstery, and carpets.

Basic Information

Product Name	C.I. Basic Red 40
CAS No.	12221-64-6
Molecular Formula	C21H21ClN6O3S
Molecular Weight	496.95 g/mol
Synonyms	Basic Red 40; Astrazon Red FBL; Aizen Cathilon Red FBLH; Maxilon Red FBL; C.I. 11245; 1,3-Benzenedicarboxamide, N1,N3-bis[4-[(2-chloro-4-nitrophenyl)azo]phenyl]-; Cationic Red FBL
EINECS	Contact for details

Quality Control

Our C.I. Basic Red 40 is produced under a stringent quality management system. Each batch is tested to ensure consistent color strength, shade, and chemical purity. Key parameters such as dye content, solubility, and impurity levels are verified. Certificates of Analysis (COA) detailing these specifications are available upon request to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	Dark Red Powder
Identification (IR)	Conforms
Color Strength	100 ± 3% (Standard)
Dye Content	≥ 95%
Moisture Content	≤ 5.0%
Water Solubility	Conforms
Ash Content	≤ 1.0%

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