Description

C.I. Direct Red 80 is a high-purity, water-soluble disazo direct dye belonging to the benzidine derivative class. This compound is valued for its strong affinity to cellulosic fibers, providing excellent wash-fastness and vibrant red coloration in industrial dyeing processes. It is essential for manufacturers in the textile, paper, and leather industries seeking reliable and consistent colorants for bulk production.

Application

• Textile Dyeing: Primary application for dyeing cotton, viscose, rayon, and other cellulosic fibers to achieve a bright red shade.
• Paper Coloring: Used in the production of colored papers, tissues, and packaging materials.
• Leather Finishing: Imparts color to leather goods in the tanning industry.
• Ink Manufacturing: Serves as a colorant for certain types of inks and toners.
• Biological Staining: Potential use as a histological stain in laboratory settings.
• Educational & Research: Used as a standard or reagent in chemical and color science research.

Basic Information

Product Name	C.I. Direct Red 80
CAS No.	25188-41-4
Molecular Formula	C29H19N5Na2O8S2
Molecular Weight	675.60 g/mol
Synonyms	Direct Red 80; Congo Corinth G; Direct Corinth G; Direct Red 8B; Pontamine Fast Red 8BL; Sirius Red 8B; C.I. 35780; Benzo Fast Red 8BL; 3,3'-((3,3'-Dimethoxy-(1,1'-biphenyl)-4,4'-diyl)bis(azo))bis(4-amino-1-naphthalenesulfonic acid) disodium salt
EINECS	246-680-8

Quality Control

Our C.I. Direct Red 80 is manufactured under a strict quality management system to ensure batch-to-batch consistency and high performance. Each lot is tested against stringent in-house specifications for parameters such as color strength, shade, solubility, and impurity profile. A Certificate of Analysis (COA) detailing these results is provided with every shipment to guarantee compliance with your technical requirements.

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. The product is light-sensitive and should be stored away from direct light exposure to maintain stability.

Specification

Item	Specification
Appearance	Dark Red to Brown Powder
Identification (IR)	Conforms to Standard
Assay (HPLC)	≥ 95.0%
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Solubility	Conforms
pH (1% Solution)	6.0 - 8.0
Ash Content	≤ 1.0%

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