Description

Chlorazol Black Lf is a high-purity, synthetic diazo dye belonging to the direct dye classification. This product is valued for its strong affinity to cellulosic fibers, providing deep, substantive black coloration with excellent wash-fastness properties. It is primarily utilized by manufacturers in the textile industry for dyeing cotton, viscose, and other natural fibers, as well as in specialized applications within biological staining and analytical chemistry. Consistent quality and reliable supply are critical for ensuring uniform batch-to-batch results in industrial processes.

Application

• Primary dyeing of cotton and other cellulosic textiles.
• Dyeing of viscose rayon and paper pulp.
• As a biological stain for microscopy in histology and cytology.
• Manufacturing of inks and colorants for specialty applications.
• Use as an indicator or reagent in specific analytical chemistry methods.
• Coloration of leather and other natural materials.

Basic Information

Product Name	Chlorazol Black Lf
CAS No.	2429-83-6
Molecular Formula	C34H25N9Na2O7S2
Molecular Weight	781.70 g/mol
Synonyms	Direct Black 38; Airedale Black E; Amanil Black L; Atlantic Black G; Benzanil Black E; Chlorazol Black E; C.I. 30235; Diazol Black L; Direct Deep Black E; Pontamine Black E
EINECS	219-373-6

Quality Control

Our Chlorazol Black Lf is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing to ensure it meets precise specifications for color strength, shade, and purity. A Certificate of Analysis (COA) detailing key parameters such as assay, solubility, and ash content is provided with each shipment to guarantee traceability and compliance with your technical 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); ensure the container is kept tightly sealed when not in use to prevent absorption of atmospheric moisture, which can affect performance.

Specification

Item	Specification
Appearance	Black to dark brown powder
Identification (IR)	Conforms to standard
Assay (Dye Content)	Min. 95%
Moisture Content	Max. 5.0%
Water Solubility	Conforms
Ash Content	Max. 1.0%
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.