Description

Direct Red 9 is a synthetic azo dye belonging to the direct dye class, known for its strong affinity for cellulosic fibers. This product is valued for its ability to produce vibrant, wash-fast red shades in textile applications without the need for a mordant. It is primarily used by manufacturers in the textile dyeing and paper coloring industries, where consistent color strength and batch-to-batch uniformity are critical for production quality.

Application

• Textile Dyeing: Primary application for dyeing cotton, viscose, rayon, and other cellulosic fibers to achieve bright red hues.
• Paper Coloring: Used in the production of colored paper, tissues, and packaging materials.
• Leather Finishing: Imparts color to leather goods in the tanning industry.
• Ink Formulation: A colorant component for certain types of inks and toners.
• Biological Staining: Potential use as a histological stain in laboratory settings.
• Educational & Research: Employed in chemical research and as a teaching tool for dye chemistry principles.

Basic Information

Product Name	Direct Red 9
CAS No.	61724-94-5
Molecular Formula	C29H19N5Na2O8S2
Molecular Weight	695.66 g/mol
Synonyms	Direct Red 9; C.I. Direct Red 9; C.I. 27900; Direct Red 9B; Direct Fast Red 9B; Direct Red 9 (C.I. 27900); Pontamine Fast Red 9B; Sirius Red 9B; Aizen Direct Fast Red 9BH; Atul Direct Fast Red 9B; Benzo Fast Red 9BL
EINECS	262-964-9

Quality Control

Our Direct Red 9 is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing to ensure it meets precise specifications for color strength, purity, and solubility. A Certificate of Analysis (COA) detailing parameters such as assay, shade, and impurity profile is provided with each shipment to guarantee consistency and support your quality assurance protocols.

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. Due to its light-sensitive nature, prolonged exposure to direct light should be avoided to prevent degradation of the dye.

Specification

Item	Specification
Appearance	Red to dark red powder
Identification (IR)	Conforms to standard
Assay (HPLC)	Min. 95%
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	Max. 5.0%
Water Solubility	Conforms
pH (1% Solution)	6.0 - 8.0
Ash Content	Max. 1.0%

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