Description

Direct Green 30 is a synthetic, high-strength direct dye belonging to the azo chemical class. It is valued for its excellent substantivity to cellulosic fibers, providing deep, vibrant green shades with good wash and light fastness properties. This dye is essential for manufacturers in the textile industry, particularly for dyeing cotton, viscose, and paper products where consistent color yield and batch-to-batch uniformity are critical.

Application

• Textile Dyeing: Primary application for exhaust and continuous dyeing of cotton, rayon, and other cellulosic fibers.
• Paper Coloring: Used for tinting and dyeing paper pulp, tissue, and specialty papers.
• Leather Finishing: Imparts color to leather goods in the tanning industry.
• Ink Formulation: A colorant component in the manufacture of certain inks and toners.
• Biological Staining: Potential use as a histological stain in laboratory settings.
• Wood Staining: Applied for coloring wood and wood-based products.

Basic Information

Product Name	Direct Green 30
CAS No.	61867-87-6
Molecular Formula	C34H25N9Na4O16S4
Molecular Weight	1085.88 g/mol
Synonyms	Direct Green NB; C.I. Direct Green 30; Direct Green 30 (C.I. 34285); Direct Green NB (C.I. 34285); Direct Green 30, disodium salt; Direct Green NB, disodium salt; Direct Green 30, tetrasodium salt; Direct Green NB, tetrasodium salt; Benzenesulfonic acid, 4,4'-[4,4'-bi-1,3,4-thiadiazole-2,5-diylbis(imino-4,1-phenyleneazo)]bis[5-hydroxy-6-(phenylamino)-, sodium salt (1:4)
EINECS	263-280-9

Quality Control

Our Direct Green 30 is manufactured under a strict quality management system to ensure consistent purity and performance. Every batch is tested against key parameters including color strength, shade, solubility, and impurity profile. A comprehensive Certificate of Analysis (COA) detailing the results of these tests is provided with each shipment to guarantee compliance with your specifications and industry standards.

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

Specification

Item	Specification
Appearance	Dark green to black powder or granules
Identification (IR)	Conforms to standard
Assay (HPLC)	Min. 90%
Color Strength	100 ± 3% (vs. Standard)
Shade	Conforms to standard
Moisture Content	Max. 5.0%
Water Solubility	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.