Description

Direct Red 80 is a synthetic anionic azo dye belonging to the direct dye class, valued for its strong affinity to cellulosic fibers. Its primary commercial value lies in providing a bright, vivid red color with good wash fastness and level dyeing properties in textile applications. This dye is essential for manufacturers in the textile industry, particularly for dyeing cotton, viscose, and paper, where consistent color strength and batch-to-batch uniformity are critical.

Application

• Textile Dyeing: Primary application for dyeing cotton, rayon, viscose, and other cellulosic fibers to a bright red shade.
• Paper Coloring: Used in the production of colored paper, tissues, and paperboard where a stable red hue is required.
• Leather Finishing: Imparts color to leather goods, offering good penetration and color fastness.
• Ink Formulation: Serves as a colorant in the manufacture of certain inks for stamp pads and specialty printing.
• Biological Staining: Employed in histology and microscopy as a stain for specific tissue components in laboratory settings.
• Educational & Research Use: Utilized in academic and industrial research laboratories for dye chemistry studies and process development.

Basic Information

Product Name	Direct Red 80
CAS No.	26101-00-8
Molecular Formula	C45H26N10Na4O13S4
Molecular Weight	1133.98 g/mol
Synonyms	Direct Red 80; C.I. 35780; Congo Corinth; Direct Corinth B; Direct Red 4B; Pontamine Fast Red 8BL; Sirius Red 4B; Aizen Direct Corinth B; Atul Direct Fast Red 8B; Benzo Fast Red 8BL
EINECS	247-476-0

Quality Control

Our Direct Red 80 is manufactured under a stringent quality management system to ensure consistent purity and performance. Every batch is tested against key parameters including color strength, shade, solubility, and impurity profile to meet industry specifications. A comprehensive Certificate of Analysis (COA) detailing assay, physical properties, and conformance is provided with each shipment to guarantee traceability and compliance.

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 incompatible materials and sources of ignition. The product is light-sensitive and should be stored away from direct light exposure to maintain stability.

Specification

Item	Specification
Appearance	Reddish-brown to dark red powder
Identification (IR)	Conforms to standard
Assay (Color Strength)	≥ 95% (by spectrophotometry)
Moisture Content	≤ 5.0% (Karl Fischer)
Water Solubility	Conforms
pH (1% Solution)	6.0 - 8.0
Ash Content	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm

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