Description

Direct Red 243 is a synthetic azo dye belonging to the direct dye class, valued for its strong affinity to cellulosic fibers. Its primary commercial value lies in providing vibrant, wash-fast red colorations in textile dyeing and printing applications. This product is essential for manufacturers in the textile, leather, and paper industries seeking consistent and reliable color performance.

Application

• Textile Dyeing: Primary application for dyeing cotton, viscose, rayon, and other cellulosic fibers to achieve a bright red shade.
• Leather Coloring: Used in the dyeing of leather goods, providing deep and uniform color penetration.
• Paper Staining: Employed in the production of colored papers, tissues, and specialty packaging materials.
• Ink Formulation: A colorant component in the manufacture of inks for various printing processes.
• Biological Staining: Potential use as a histological stain in laboratory settings for microscopic analysis.

Basic Information

Product Name	Direct Red 243
CAS No.	86543-85-3
Molecular Formula	C29H19N7Na2O7S2
Molecular Weight	695.67 g/mol
Synonyms	C.I. Direct Red 243; Direct Fast Scarlet 4BS; Direct Scarlet 4BS; Pontamine Scarlet 4BS; Aizen Direct Scarlet 4BH; Atul Direct Scarlet 4BS; Dinamine Scarlet 4BS; Solius Scarlet 4BS; 2,7-Naphthalenedisulfonic acid, 5-[[4'-[(2,6-diamino-3-methyl-5-sulfophenyl)azo][1,1'-biphenyl]-4-yl]azo]-4-hydroxy-3-[(4-methoxyphenyl)azo]-, disodium salt
EINECS	Contact for details

Quality Control

Our Direct Red 243 is produced under a strict quality management system to ensure batch-to-batch consistency and performance. Each lot is tested against key parameters including color strength, shade, solubility, and impurity profile. A Certificate of Analysis (COA) documenting purity, physical properties, and conformance to specification is provided 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 incompatible materials. The product is light-sensitive and should be stored away from direct light exposure.

Specification

Item	Specification
Appearance	Red to dark red powder
Identification (IR)	Conforms to standard
Color Strength	100 ± 3% (vs. Standard)
Shade	Conforms to standard
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 0.5%
pH (1% Solution)	6.0 - 8.0
Heavy Metals (as Pb)	≤ 20 ppm

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