Description

Direct Black 38 is a high-purity, synthetic diazo dye belonging to the direct dye class, widely recognized for its deep, intense black coloration. It is valued for its excellent substantivity to cellulosic fibers, providing robust and wash-fast shades without the need for a mordant. This product is essential for manufacturers in the textile, leather, and paper industries seeking a reliable and cost-effective black dye for large-scale production. Our supply of Direct Black 38 CAS NO 1937-37-7 is backed by stringent quality control to ensure batch-to-batch consistency for your critical applications.

Application

• Textile Dyeing: Primary application for dyeing cotton, rayon, linen, and other cellulosic fibers to achieve deep black shades.
• Leather Processing: Used in the dyeing of leather goods, including footwear, bags, and upholstery, for uniform and durable black finishes.
• Paper Coloring: Employed in the production of colored papers, specialty packaging, and decorative papers where a strong black hue is required.
• Ink Formulation: A key component in the manufacture of certain types of inks for industrial marking and printing.
• Wood Staining: Utilized to provide a deep black stain for wood products and veneers.
• Biological Staining (Historical): Previously used in biological microscopy; modern applications require specific, certified grades.

Basic Information

Product Name	Direct Black 38
CAS No.	1937-37-7
Molecular Formula	C34H25N9Na2O7S2
Molecular Weight	781.72 g/mol
Synonyms	Direct Black 38; Direct Black EX; C.I. 30235; Direct Deep Black EW; Pontamine Black E; Benzo Deep Black; Diazol Black 2V; Airedale Black E; Atlantic Black E; Durazol Black E; Sirius Black E; Chlorazol Black E; Direct Black A; Direct Black G; Direct Black L; Direct Black V
EINECS	217-710-3

Quality Control

Our Direct Black 38 is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing to ensure it meets precise specifications for color strength, shade, solubility, and impurity profiles. We provide Certificates of Analysis (COA) with key parameters to verify product quality and support your own quality assurance protocols. For applications requiring specific regulatory compliance, please contact our technical team to discuss your needs.

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	Black to Bluish-Black Powder
Identification (IR)	Conforms to Standard
Color Strength	100 ± 3% (vs. Standard)
Shade	Conforms to Standard
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
pH (1% Solution)	5.0 - 7.5
Heavy Metals (as Pb)	≤ 50 ppm

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