Description

C.I. Reactive Red 3:1 is a high-performance, water-soluble reactive dye belonging to the azo chemical class, widely recognized for its bright red hue and excellent fastness properties. Its primary value lies in its ability to form a covalent bond with cellulosic fibers like cotton and viscose, ensuring superior wash and light fastness compared to direct or acid dyes. This dye is essential for textile manufacturers, printing ink formulators, and research laboratories involved in developing colored materials. The compound is supplied as a fine powder and is identified by CAS NO 92307-87-4.

Application

• Textile Dyeing: Primary application for exhaust and continuous dyeing of cotton, linen, viscose, and other cellulosic fibers.
• Textile Printing: Used in pigment printing pastes and inks for creating vibrant, durable prints on fabric.
• Leather Coloring: Imparts a stable red color to finished leather goods.
• Paper Coloring: Employed in the production of specialty colored papers and paper products.
• Ink Formulation: A key component in the manufacture of certain types of industrial and specialty printing inks.
• Research & Development: Serves as a standard or intermediate in chemical synthesis and dye research.
• Educational Use: Utilized in academic settings for teaching dye chemistry and application techniques.

Basic Information

Product Name	C.I. Reactive Red 3:1
CAS No.	92307-87-4
Molecular Formula	C26H17ClN7Na3O11S3
Molecular Weight	872.09 g/mol
Synonyms	Reactive Red 3:1; Reactive Red M-3B; C.I. 18215; Reactive Red KE-3B; Levafix Red E-3B; Procion Red H-3B; Remazol Red 3B; Drimarene Red K-3B; Vinylsulfone Azo Dye; 1,3,5-Triazine-2,4,6-triamine derivative dye; Sodium 4-[(4,6-dichloro-1,3,5-triazin-2-yl)amino]-2-[(E)-2-(4-sulfonatonaphthalen-1-yl)diazen-1-yl]-5-(2-sulfonatooxyethylsulfonyl)benzenesulfonate
EINECS	Contact for details

Quality Control

Our production of C.I. Reactive Red 3:1 adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance reliability. Every lot is tested against key parameters including color strength, shade, solubility, and reactive group content. We provide comprehensive Certificates of Analysis (COA) detailing all test results, and our quality system supports compliance with relevant industry and regulatory standards. Specifications can be aligned with customer-specific requirements 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). This product is hygroscopic (moisture-sensitive) and light-sensitive; therefore, containers must be kept tightly sealed when not in use to prevent moisture absorption and degradation. Keep away from incompatible materials such as strong oxidizing agents.

Specification

Item	Specification
Appearance	Reddish-brown powder
Identification (IR)	Conforms to standard
Color Strength	100 ± 3% (vs. Standard)
Shade	Conforms to standard
Moisture Content	≤ 5.0%
Water Solubility	≥ 50 g/L (at 50°C)
pH (1% Solution)	6.0 - 8.0
Dye Content	≥ 80%
Fastness Properties (Cotton)	Wash: 4-5; Light: 5-6

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