Description

Direct Grey D is a synthetic azo dye belonging to the class of direct dyes, valued for its strong affinity to cellulosic fibers like cotton and rayon without the need for a mordant. This compound is engineered to deliver consistent, deep grey shades with excellent wash and light fastness properties, ensuring color durability in finished textiles. It is a critical component for dye houses and textile manufacturers seeking reliable, cost-effective coloration for yarn, fabric, and garment production.

Application

• Textile Dyeing: Primary application for exhaust and continuous dyeing of cellulosic fibers such as cotton, viscose, and rayon to achieve grey hues.
• Paper Coloring: Used in the tinting and surface coloring of paper products where direct dye fixation is required.
• Leather Processing: Employed in the dyeing of leather goods, providing good penetration and color uniformity.
• Ink Formulation: Serves as a colorant in the manufacture of certain types of inks for specialized printing applications.
• Research & Development: Utilized as a standard or reference dye in analytical chemistry and textile research laboratories.

Basic Information

Product Name	Direct Grey D
CAS No.	2945-96-2
Molecular Formula	C34H23N7Na2O10S2
Molecular Weight	799.75 g/mol
Synonyms	Direct Grey D; C.I. Direct Black 17; Direct Deep Black EW; Direct Black EW; Pontamine Black EW; Aizen Direct Deep Black EW; Atlantic Black EW; Benzo Deep Black EW; Diazol Deep Black EW; Sirius Grey D
EINECS	220-957-4

Quality Control

Our Direct Grey D is manufactured under a stringent 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 the demanding standards of the textile industry. Certificates of Analysis (COA) detailing purity, physical properties, and conformance to specification are provided with every shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from strong oxidizing agents. The product is light-sensitive; prolonged exposure to light should be avoided to prevent degradation.

Specification

Item	Specification
Appearance	Dark grey to black powder
Identification (IR)	Conforms to standard
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
pH (1% Solution)	6.0 - 8.0
Shade	Conforms to standard
Fastness Properties	Contact for details

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