Description

C.I. Direct Blue 237 is a high-performance, water-soluble direct dye belonging to the azo chemical class, identified by CAS NO 106254-34-6. It is valued for its excellent substantivity to cellulosic fibers, providing deep, vibrant blue shades with good wash and light fastness properties. This dye is essential for manufacturers in the textile industry seeking reliable and efficient coloring solutions for cotton, viscose, and other regenerated cellulose materials.

Application

• Textile Dyeing: Primary application for exhaust and continuous dyeing of cotton, rayon, and other cellulosic fabrics.
• Paper Coloring: Used for tinting and dyeing paper pulp to achieve uniform blue coloration.
• Leather Finishing: Employed in the dyeing of leather goods to provide rich blue tones.
• Ink Formulation: A colorant component in the manufacture of certain inks, including for stationery and packaging.
• Biological Staining: Potential use as a histological stain in laboratory settings for microscopic analysis.

Basic Information

Product Name	C.I. Direct Blue 237
CAS No.	106254-34-6
Molecular Formula	C32H20N7Na3O11S3
Molecular Weight	867.77 g/mol
Synonyms	Direct Blue 237; C.I. 23820; Direct Blue 237 (C.I. 23820); Benzenesulfonic acid, 4,4'-[1,3,5-triazine-2,4,6-triyltriimino(7-phenylazo-4-hydroxy-3,1-phenylene)azo]bis-, trisodium salt; Direct Blue D-3R; Direct Blue 3R; Sirius Blue 3R; Solophenyl Blue 3R
EINECS	Contact for details

Quality Control

Our production of C.I. Direct Blue 237 adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance. Each lot is analyzed for key parameters including color strength, shade, solubility, and impurity profile. Certificates of Analysis (COA) documenting these results are available upon request to support your quality assurance and regulatory compliance 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 hygroscopic (moisture-sensitive); ensure the container is properly sealed after each use to prevent moisture absorption.

Specification

Item	Specification
Appearance	Dark Blue to Bluish-Black Powder
Identification (IR)	Conforms to Standard
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 0.5%
Shade	Conforms to Standard
Solubility in Water	Completely Soluble

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