Description

Direct Yellow 27 is a synthetic azo dye belonging to the direct dye class, valued for its strong affinity to cellulosic fibers without the need for a mordant. Its primary value lies in providing a bright, economical, and wash-fast yellow coloration in aqueous dyeing processes. This product is essential for manufacturers in the textile, paper, and leather industries seeking consistent and reliable dyeing performance for natural substrates like cotton, viscose, and paper pulp.

Application

• Textile Dyeing: Primary application for dyeing cotton, viscose rayon, and other cellulosic fibers to achieve a bright yellow shade.
• Paper Coloring: Used in the mass coloration of paper and paperboard products, including tissue, packaging, and specialty papers.
• Leather Finishing: Imparts color to leather goods, offering good penetration and uniformity on tanned hides.
• Ink Formulation: A colorant component in the manufacture of certain types of inks, particularly for porous substrates.
• Biological Staining: Potential use as a histological stain in laboratory settings for microscopic analysis.
• Craft and Educational Dyes: Employed in educational kits and craft applications for dyeing natural materials.

Basic Information

Product Name	Direct Yellow 27
CAS No.	10190-68-8
Molecular Formula	C30H26N4Na2O8S2
Molecular Weight	680.66 g/mol
Synonyms	Direct Fast Yellow GC; C.I. 13950; Direct Yellow GC; Pontamine Fast Yellow GC; Amanil Fast Yellow GC; Benzo Fast Yellow GC; Chlorazol Yellow GC; Sirius Supra Yellow GC
EINECS	233-465-1

Quality Control

Our Direct Yellow 27 is manufactured under a strict quality management system to ensure batch-to-batch consistency and performance. Each lot is tested against key parameters including color strength, shade, solubility, and impurity profile to meet industry standards for direct dyes. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and performance metrics is provided with every shipment.

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. The product is light-sensitive (store away from light).

Specification

Item	Specification
Appearance	Yellow to brownish-yellow powder
Identification (IR)	Conforms to standard
Assay (Dye Content)	Min. 95%
Moisture Content	Max. 5.0%
Water Insoluble Matter	Max. 0.5%
Shade	Conforms to standard
Solubility in Water	Conforms
pH (1% Solution)	6.0 - 8.0

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