Description

Basic Yellow 51 is a cationic, methine-based dye belonging to the polymethine chemical class. This product is valued for its bright, intense yellow hue and strong affinity for synthetic fibers, particularly acrylics, making it a critical component in textile coloration. Industries requiring vibrant and wash-fast coloration, such as textile manufacturing, ink production, and specialty paper coating, rely on this high-performance dye. Its consistent quality ensures reliable batch-to-batch performance for demanding industrial applications.

Application

• Textile Dyeing: Primary application for dyeing acrylic fibers, modacrylics, and other synthetic materials to achieve brilliant, lightfast yellow shades.
• Ink Formulation: Used in the production of inks for jet printing, flexography, and other applications requiring stable, vivid yellow pigments.
• Paper Coloring: Employed in the surface coating and tinting of specialty papers, including decorative and security papers.
• Leather Finishing: Applied in the dyeing process for leather goods to provide consistent and durable yellow coloration.
• Biological Staining: Potential use as a fluorescent stain in certain biological and histological applications for microscopy.
• Plastics and Polymers: Incorporated for mass coloration of plastics where a stable yellow colorant is required.

Basic Information

Product Name	Basic Yellow 51
CAS No.	83949-75-1
Molecular Formula	C23H23N3O3S
Molecular Weight	421.51 g/mol
Synonyms	Basic Yellow 51; C.I. 48054; Astrazon Yellow 8GL; Aizen Cathilon Yellow 8GLH; Maxilon Yellow 8GL; Sevron Yellow 8GMF; Yoracryl Yellow 8G; 1H-Benz[e]indolium, 2-[2-[4-(dimethylamino)phenyl]ethenyl]-1,3,3-trimethyl-, methyl sulfate
EINECS	Contact for details

Quality Control

Every batch of Basic Yellow 51 is manufactured and tested under a stringent quality management system to ensure it meets precise coloristic and chemical specifications. Our products undergo rigorous quality testing, including spectrophotometric analysis for strength and shade, to ensure compliance with industry standards. Certificates of Analysis (COA) detailing purity, strength, and impurity profiles 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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect performance. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Yellow to orange-yellow powder
Identification (IR)	Conforms to standard
Assay (HPLC)	Min. 95%
Color Strength	100 ± 3% (vs. Standard)
Shade	Conforms to standard
Moisture Content	Max. 5.0%
Ash Content	Max. 1.0%
Solubility	Soluble in water and common polar organic solvents

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