Description

Fast Black K Salt is a diazonium salt primarily used as a key coupling component in the production of azo dyes and pigments. This compound is valued for its ability to impart deep, fast black shades with excellent color strength and lightfastness properties. It is an essential intermediate for manufacturers in the textile, leather, ink, and specialty coatings industries seeking high-performance black colorants.

Application

• Primary coupling component for the synthesis of azo black dyes used in textile dyeing and printing.
• Manufacture of pigments for inks, including printing inks and specialty inks requiring high opacity and stability.
• Production of colorants for leather finishing and dyeing processes.
• Used in the formulation of paper dyes and coatings.
• Intermediate for creating specialty pigments used in plastics and masterbatch coloring.
• Research and development of novel high-performance colorants in industrial and academic laboratories.

Basic Information

Product Name	Fast Black K Salt
CAS No.	64071-86-9
Molecular Formula	C12H9ClN4O4S
Molecular Weight	340.74 g/mol
Synonyms	Fast Black K Salt; 2,5-Dichloro-4-(4-nitrophenyl)azo)benzenesulfonic Acid Diazonium Salt; 4-Nitroaniline-2,5-dichloro-4-sulfobenzenediazonium Salt; C.I. 37190; Diazol Black K; Black K Salt; Fast Black Salt K; Azoic Diazo Component 38
EINECS	Contact for details

Quality Control

Our Fast Black K Salt is manufactured under strict quality protocols to ensure batch-to-batch consistency and performance in your formulations. We provide comprehensive Certificates of Analysis (COA) with each shipment, detailing key parameters such as purity, strength, and impurity profiles. Our quality management system adheres to industry best practices, ensuring reliable supply for critical industrial applications.

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 product is hygroscopic (moisture-sensitive) and light-sensitive; containers must be kept tightly sealed immediately after use to prevent degradation from atmospheric moisture and light exposure. Keep away from heat sources and incompatible materials.

Specification

Item	Specification
Appearance	Yellowish to Brown Powder or Crystals
Identification (IR)	Conforms to Standard
Assay (Diazotizable Content)	≥ 95.0%
Moisture Content	≤ 5.0%
Insoluble Matter	≤ 0.5%
pH (of slurry)	Contact for details

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