Description

Directblue218 is a synthetic, water-soluble direct dye belonging to the azo chemical class. This high-purity colorant is valued for its strong affinity to cellulosic fibers, providing excellent wash and light fastness properties. It is primarily utilized by manufacturers in the textile, paper, and leather industries for consistent and vibrant coloration. The product is supplied under strict quality control to ensure batch-to-batch uniformity for industrial applications.

Application

• Textile Dyeing: Primary application for dyeing cotton, viscose, rayon, and other cellulosic fibers.
• Paper Coloring: Used in the production of colored papers, tissues, and paperboard.
• Leather Finishing: Imparts color to leather goods in the tanning industry.
• Ink Formulation: Serves as a colorant component in certain specialty inks.
• Biological Staining: May be used in specific histological or microbiological staining protocols.
• Research & Development: Employed as a standard or reagent in chemical and material science research.

Basic Information

Product Name	Directblue218
CAS No.	10401-50-0
Molecular Formula	C32H20N6Na4O16S4
Molecular Weight	996.80 g/mol
Synonyms	Direct Blue 218; C.I. 24401; Benzenesulfonic acid, 4,4'-[1,3,5-triazine-2,4,6-triyltris(imino-4,1-phenyleneazo)]tris[5-amino-4-hydroxy-, tetrasodium salt; Pontamine Blue 4B; Sirius Blue S-BRR; Chlorantine Fast Blue 7GL; Solophenyl Blue 4GL; Diazol Blue 2R
EINECS	233-877-5

Quality Control

Our Directblue218 is manufactured under a stringent quality management system. Each batch is tested to ensure it meets precise specifications for color strength, shade, solubility, and impurity profiles. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and performance characteristics is provided with every shipment to guarantee supply reliability and consistent performance in your processes.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, 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	Dark Blue to Bluish-Black Powder
Identification (IR)	Conforms to Standard
Assay (HPLC)	≥ 95.0%
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Solubility	Clear Solution
Ash Content	≤ 30.0%
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.