Description

Direct Black 38 is a high-purity, synthetic diazo dye widely recognized for its deep, intense black coloration and excellent substantivity to cellulosic fibers. Its primary value lies in delivering consistent, high-strength shades with good fastness properties in demanding industrial dyeing processes. This product is essential for manufacturers in the textile, leather, and paper industries seeking reliable and cost-effective black dyes for bulk production. Direct Black 38 CAS NO 381937-37-7 is a key component for creating uniform, durable black finishes on cotton, viscose, and other materials.

Application

• Textile Dyeing: Primary application for dyeing cotton, viscose, rayon, and other cellulosic fibers to achieve deep black shades.
• Leather Processing: Used in the dyeing of leather goods, providing rich, uniform black color with good penetration.
• Paper Coloring: Employed in the manufacture of colored papers, cardboards, and specialty packaging requiring a black hue.
• Ink Formulation: A pigment source in the production of inks for various printing applications.
• Wood Staining: Utilized to impart a dark black finish to wood and wood-based products.
• Biological Staining (Histology): In some specialized grades, used as a stain in microscopic analysis of biological tissues.

Basic Information

Product Name	Direct Black 38
CAS No.	381937-37-7
Molecular Formula	C34H25N9Na2O7S2
Molecular Weight	781.72 g/mol
Synonyms	Direct Black 38; Direct Black BN; C.I. 30235; C.I. Direct Black 38; Direct Deep Black EW; Direct Black EX; Pontamine Black E; Airedale Black BD; Benzo Deep Black; Diazol Black BN; Sirius Black B
EINECS	Contact for details

Quality Control

Our Direct Black 38 is manufactured under a stringent quality management system to ensure batch-to-batch consistency and reliability. The product is tested against key parameters including color strength, shade, solubility, and impurity profiles to meet industry specifications. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and performance characteristics is provided with every shipment to guarantee it meets your application requirements.

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). This material is hygroscopic (moisture-sensitive); keep the container tightly sealed when not in use to prevent absorption of atmospheric moisture, which can affect performance.

Specification

Item	Specification
Appearance	Black to Bluish-Black Powder
Identification (IR)	Conforms to Standard
Color Strength	≥ 100% (vs. Standard)
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
pH (1% Solution)	6.0 - 8.0
Ash Content	≤ 1.0%

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