Description

Direct Green 27 is a synthetic, water-soluble dye belonging to the direct dye class, widely recognized for its strong affinity to cellulose fibers. Its primary value lies in providing a deep, vibrant green color with excellent wash and light fastness properties on cotton, viscose, and other cellulosic materials. This dye is essential for industrial-scale textile manufacturers, paper colorants, and leather tanneries seeking consistent, high-quality coloration. The product is supplied as a high-purity powder to ensure batch-to-batch consistency and optimal performance in demanding applications.

Application

• Textile Dyeing: Primary application for dyeing cotton, rayon, linen, 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 specialty papers and boards.
• Leather Finishing: Imparts color to leather goods, providing good penetration and uniformity on tanned hides.
• Ink Formulation: Serves as a colorant in the manufacture of certain types of inks, including those for flexographic and gravure printing.
• Wood Staining: Applied for coloring wood and wood-based products, offering good clarity and grain enhancement.
• Biological Staining (Histology): In some formulations, it can be used as a biological stain for microscopic analysis in laboratory settings.

Basic Information

Product Name	Direct Green 27
CAS No.	12239-31-5
Molecular Formula	C34H25N9Na4O16S4
Molecular Weight	1085.89 g/mol
Synonyms	Direct Green B; C.I. Direct Green 27; Direct Green BS; Direct Green G; Direct Green BN; Direct Green JB; Direct Green 2B; Benzo Dark Green B
EINECS	235-447-8

Quality Control

Our Direct Green 27 is manufactured under a strict quality management system to ensure it meets the high standards required for industrial dyeing applications. Every batch is tested against key parameters including color strength, shade, solubility, and impurity profile to guarantee consistent performance and reliable results for our customers. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and conformance to specification is provided with each shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Keep away from strong oxidizing agents. The product is hygroscopic (moisture-sensitive); ensure the container is securely sealed after each use to prevent moisture absorption and caking.

Specification

Item	Specification
Appearance	Dark Green to Bluish-Green Powder
Identification (IR)	Conforms to Standard
Color Strength	100 ± 3% (vs. Standard)
Shade	Conforms to Standard
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 0.5%
Solubility in Water	Complete (at 50°C)
pH (1% Solution)	7.0 - 9.0
Heavy Metals (as Pb)	≤ 50 ppm

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