Description

C.I. Direct Red 218 is a high-performance, water-soluble azo dye belonging to the direct dye class, widely recognized for its strong affinity to cellulosic fibers. Its primary value lies in delivering vibrant, durable red shades with excellent build-up properties and good wash fastness on cotton, viscose, and other natural fibers. This dye is essential for textile manufacturers, paper colorants, and leather tanneries seeking reliable and cost-effective coloration solutions. The compound is identified by CAS No. 61725-02-8.

Application

• Textile Dyeing: Primary application for exhaust and continuous dyeing of cotton, rayon, and other cellulosic fabrics.
• Paper Coloring: Used in the production of colored papers, tissues, and paperboard where a strong red hue is required.
• Leather Finishing: Imparts color to leather goods in the tanning industry.
• Ink Formulation: A component in the manufacture of certain types of inks, including for stationery and packaging.
• Biological Staining: Potential use as a histological stain in laboratory settings.
• Craft and Specialty Dyes: Suitable for use in artisanal dyeing and craft applications.

Basic Information

Product Name	C.I. Direct Red 218
CAS No.	61725-02-8
Molecular Formula	C35H25N7Na2O10S2
Molecular Weight	813.78 g/mol
Synonyms	Direct Red 218; C.I. 29167; Direct Fast Scarlet 4BS; Direct Scarlet 4BS; Direct Scarlet BS; Pontamine Scarlet BS; Atul Direct Scarlet BS; Dinamine Scarlet BS; Amanil Scarlet BS; Solar Scarlet BS
EINECS	262-964-5

Quality Control

Our C.I. Direct Red 218 is manufactured under strict quality control protocols to ensure batch-to-batch consistency and performance. The product is tested against key parameters including color strength, shade, solubility, and impurity profile. While produced to meet general industrial grade specifications, we can provide material compliant with specific buyer requirements. A Certificate of Analysis (COA) detailing purity, physical properties, and conformance is supplied with every shipment.

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 light-sensitive (store away from light) and hygroscopic (moisture-sensitive); prolonged exposure to air and humidity should be avoided to maintain product integrity.

Specification

Item	Specification
Appearance	Reddish-brown powder
Identification (IR)	Conforms to standard
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 0.5%
pH (1% Solution)	6.0 - 8.0
Shade	Conforms to standard
Fastness Properties	Typical data available

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