Description

Direct Blue 273 is a synthetic, high-strength disazo direct dye known for its excellent affinity to cellulosic fibers. This product is valued for its deep, vibrant blue shade and good fastness properties, making it a critical component in industrial dyeing processes. It is primarily used by manufacturers in the textile industry for coloring cotton, viscose, and other regenerated cellulose materials, as well as in the paper and leather industries.

Application

• Primary dyeing of cotton yarns and fabrics.
• Coloration of viscose rayon and other regenerated cellulose fibers.
• Dyeing of paper pulp for specialty colored papers.
• Application in the leather tanning industry for finishing.
• Used in the production of colored wood stains and related products.
• Potential use in the formulation of inks for specific applications.

Basic Information

Product Name	Direct Blue 273
CAS No.	70956-20-6
Molecular Formula	C34H23N7Na2O9S2
Molecular Weight	783.75 g/mol
Synonyms	Direct Blue 273; C.I. Direct Blue 273; Direct Blue 2B; Direct Blue B2RL; Amanil Blue 2B; Atul Direct Blue 2B; Dinamine Blue 2B; Direct Blue 2B (VAN); Direct Blue B2R; Direct Blue BRL; Direct Blue BRL-N; Direct Blue FBL; Direct Blue GL; Direct Blue R Special; Direct Fast Blue 2B; Direct Navy Blue 2B; Sirius Blue 2B
EINECS	Contact for details

Quality Control

Our Direct Blue 273 is manufactured under a stringent quality management system to ensure batch-to-batch consistency and performance. The product is tested against key parameters including color strength, shade, solubility, and fastness properties. Certificates of Analysis (COA) detailing purity and performance specifications are available upon request to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at room temperature (15-25°C). Due to its hygroscopic nature, the container must be kept tightly sealed to prevent moisture absorption, which can affect product performance.

Specification

Item	Specification
Appearance	Dark Blue 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%
Solubility in Water	Conforms
Fastness Properties (Typical)	Light: 4-5; Wash: 3-4; Rubbing: 4

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