Description

Direct Fast Yellow 5GL is a high-performance, water-soluble azo dye belonging to the class of direct dyes. This compound is valued for its strong affinity to cellulosic fibers, providing excellent wash and light fastness properties. It is primarily used in the textile industry for dyeing and printing cotton, viscose, and other natural fibers, offering a bright and consistent yellow shade. Its reliable performance makes it a critical component for manufacturers requiring durable and vibrant coloration.

Application

• Textile Dyeing: Primary application for dyeing cotton, rayon, viscose, and other cellulosic fibers in exhaust and continuous dyeing processes.
• Textile Printing: Used in printing pastes for direct and discharge printing on natural fiber fabrics.
• Leather Coloring: Employed in the dyeing of leather goods to achieve a uniform yellow color.
• Paper Coloring: Suitable for tinting paper and paperboard where good fastness is required.
• Ink Formulation: Can be used in the manufacture of certain types of inks for specialized applications.

Basic Information

Product Name	Direct Fast Yellow 5GL
CAS No.	2829-42-7
Molecular Formula	C30H21N5Na2O8S2
Molecular Weight	681.62 g/mol
Synonyms	Direct Yellow 5GL; C.I. Direct Yellow 27; Direct Fast Yellow 5G; Amanil Fast Yellow 5GL; Atul Direct Fast Yellow 5GL; Pyrazol Fast Yellow 5GL; Sirius Supra Yellow 5GL; C.I. 13950; Benzenesulfonic acid, 4,4'-[1,3,4-thiadiazole-2,5-diylbis(azo)]bis[5-hydroxy-6-(2-phenoxyphenyl)azo]-, disodium salt
EINECS	220-599-7

Quality Control

Our Direct Fast Yellow 5GL is manufactured under a stringent quality management system. Every batch is tested to ensure it meets precise specifications for color strength, shade, solubility, and fastness properties. A comprehensive Certificate of Analysis (COA) detailing purity, physical parameters, and performance characteristics is provided with each shipment to guarantee consistent quality and batch-to-batch reliability for your production processes.

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). This product is hygroscopic (moisture-sensitive); ensure the container is kept tightly sealed to prevent absorption of atmospheric moisture, which can affect performance.

Specification

Item	Specification
Appearance	Yellow to Brownish-Yellow Powder
Identification (IR)	Conforms
Color Strength	100 ± 3% (Standard)
Shade	Conforms to Standard
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 0.5%
Solubility in Water	Conforms
Fastness Properties (Typical)	Light: 5-6; Wash: 4-5; Water: 4-5

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