Description

C.I. Direct Red 233 is a synthetic, water-soluble azo dye belonging to the direct dye class, identified by CAS No. 12235-83-5. It is valued for its strong affinity to cellulosic fibers, providing vibrant and wash-fast red colorations without the need for a mordant. This dye is essential for manufacturers in the textile industry seeking efficient and economical coloring solutions for cotton, viscose, and other natural fibers.

Application

• Textile Dyeing: Primary application for exhaust and continuous dyeing of cotton, rayon, and other cellulosic fabrics.
• Paper Coloring: Used to impart color to various grades of paper and paperboard.
• Leather Finishing: Employed in the dyeing of leather goods to achieve consistent red hues.
• Ink Formulation: A colorant component in the manufacture of certain inks and toners.
• Biological Staining: Potential use as a histological stain in laboratory settings.

Basic Information

Product Name	C.I. Direct Red 233
CAS No.	12235-83-5
Molecular Formula	C29H19N7Na2O7S2
Molecular Weight	695.67 g/mol
Synonyms	Direct Red 233; C.I. 29160; Direct Fast Scarlet 4BS; Pontamine Fast Scarlet 4BS; Sirius Scarlet 4BS; Direct Scarlet 4BS; Benzo Scarlet 4BS; Atul Direct Fast Scarlet 4BS
EINECS	Contact for details

Quality Control

Our products undergo rigorous quality testing to ensure batch-to-batch consistency and compliance with industry standards for color strength, solubility, and shade. Key parameters including purity, heavy metal content, and fastness properties are monitored. A Certificate of Analysis (COA) detailing specific test results is available for every shipment upon request.

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.

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	≤ 1.0%
pH (1% Solution)	6.0 - 8.0
Heavy Metals (as Pb)	≤ 50 ppm

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