Description

Direct Yellow 24 is a high-purity, water-soluble diazo dye belonging to the direct dye class, known for its strong affinity to cellulosic fibers. This compound is valued for its ability to produce bright, level shades of yellow with good fastness properties in industrial dyeing processes. It is primarily utilized by manufacturers in the textile, paper, and leather industries for coloring natural fibers and materials.

Application

• Textile Dyeing: Primary application for dyeing cotton, viscose, rayon, and other cellulosic fibers to achieve vibrant yellow hues.
• Paper Coloring: Used in the production of colored papers, tissues, and paperboard where a stable yellow color is required.
• Leather Finishing: Employed in the dyeing of leather goods, providing consistent and penetrating color.
• Ink Formulation: A colorant component in the manufacture of certain types of inks, including stamp pad and flexographic inks.
• Biological Staining: Potential use as a histological stain in laboratory settings for microscopic analysis.
• Specialty Coatings: Incorporated into coatings for wood or other porous materials where direct dye properties are advantageous.

Basic Information

Product Name	Direct Yellow 24
CAS No.	6486-29-9
Molecular Formula	C29H19N5Na2O8S2
Molecular Weight	695.66 g/mol
Synonyms	Direct Yellow R; C.I. Direct Yellow 24; Direct Fast Yellow R; Sirius Yellow R; Chlorazol Yellow R; Benzo Fast Yellow R; Diazol Yellow R; Pyrazol Yellow R; 2,2'-[1,1'-Biphenyl]-4,4'-diyldi(E)diazenyl]bis[5-amino-4-hydroxy-3-[(4-sulfophenyl)azo]-, disodium salt
EINECS	229-353-5

Quality Control

Our Direct Yellow 24 is manufactured under a strict quality management system to ensure batch-to-batch consistency and high performance. Each lot is tested against rigorous in-house specifications, which typically include parameters for color strength, shade, solubility, and impurity profile. A Certificate of Analysis (COA) detailing these results is provided with every shipment to guarantee 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 room temperature (15-25°C). Keep away from incompatible materials and moisture to maintain product integrity.

Specification

Item	Specification
Appearance	Brownish-yellow to reddish-brown powder
Identification (IR)	Conforms to standard
Assay (HPLC)	Min. 95%
Moisture Content	Max. 5.0%
Water Solubility	Conforms
Ash Content	Max. 1.0%
pH (1% Solution)	6.0 - 8.0
Heavy Metals (as Pb)	Max. 20 ppm

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