Description

Direct Yellow 137 is a high-performance, water-soluble azo dye belonging to the direct dye class, valued for its strong affinity to cellulosic fibers. Its primary commercial value lies in providing a bright, clear yellow shade with excellent build-up properties and good wet fastness on cotton, viscose, and other natural fibers. This dye is essential for textile manufacturers, paper colorists, and leather tanners seeking efficient and cost-effective coloring solutions for bulk materials.

Application

• Textile Dyeing: Primary application for dyeing cotton, viscose, rayon, and other cellulosic fabrics in exhaust and continuous dyeing processes.
• Paper Coloring: Used in the mass coloration of paper pulp to produce uniformly colored paper products, including packaging and specialty papers.
• Leather Finishing: Imparts a stable yellow color to leather goods, offering good penetration and levelness on tanned hides.
• Ink Formulation: A colorant component in the manufacture of inks for flexographic and other printing applications where water-based systems are preferred.
• Wood Staining: Employed in aqueous stain formulations for coloring wood, providing a transparent and grain-enhancing finish.

Basic Information

Product Name	Direct Yellow 137
CAS No.	71838-47-6
Molecular Formula	C29H19N5Na2O8S2
Molecular Weight	695.66 g/mol
Synonyms	Direct Fast Yellow GC; C.I. Direct Yellow 137; Direct Yellow GC; Amanil Fast Yellow GC; Atul Direct Fast Yellow GC; Pyrazol Yellow GC; Sirius Supra Yellow GC; Dinamine Fast Yellow GC
EINECS	Contact for details

Quality Control

Our production of Direct Yellow 137 adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance reliability. Every lot is analyzed for critical parameters including shade, strength, solubility, and fastness properties. Certificates of Analysis (COA) detailing purity, physical properties, and application test results are available upon request to support your quality assurance and regulatory compliance needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at ambient temperature (15-25°C). Keep away from incompatible materials and sources of heat. The product is light-sensitive (store away from light).

Specification

Item	Specification
Appearance	Yellow to reddish-brown powder
Identification (IR)	Conforms to standard
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
Shade on Cotton	Conforms to standard
Fastness Properties (Typical)	Light: 5-6; Wash: 3-4; Water: 3-4

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