Description

Reactive Blue 31 is a high-purity, anthraquinone-based reactive dye designed for covalent bonding with textile fibers. This product is essential for achieving brilliant, wash-fast blue colorations in industrial dyeing processes. It is primarily used by manufacturers in the textile industry for dyeing and printing cellulosic fibers like cotton and viscose, as well as in research and development for specialty colorant applications.

Application

• Textile Dyeing: Primary application for exhaust and continuous dyeing of cotton, linen, and other cellulosic fabrics.
• Textile Printing: Used in printing pastes for creating sharp, durable blue patterns on natural fiber textiles.
• Leather Coloring: Imparts color to leather goods where reactive dye properties are beneficial.
• Paper Staining: Employed for specialty paper coloring requiring high color fastness.
• Biomolecule Labeling: Utilized in research settings as a reactive probe for labeling proteins or other biomolecules.
• Ink Formulation: A component in the manufacture of specialized inks for industrial marking.

Basic Information

Product Name	Reactive Blue 31
CAS No.	12225-48-8
Molecular Formula	C22H16ClN7O8S2
Molecular Weight	638.00 g/mol
Synonyms	Reactive Blue 31; C.I. Reactive Blue 31; Remazol Brilliant Blue R; Levafix Brilliant Blue E-BRA; Procion Blue H-ERD; Drimarene Brilliant Blue K-2RL; C.I. 621176; 1-Amino-4-[[4-[(2-sulfooxyethyl)sulfonyl]phenyl]amino]-9,10-dihydro-9,10-dioxo-2-anthracenesulfonic acid ester with N-(5-chloro-2,6-difluoro-4-pyrimidinyl)-2,4-difluorobenzenesulfonamide (principal component)
EINECS	Contact for details

Quality Control

Our Reactive Blue 31 is manufactured under a stringent quality management system. Every batch undergoes comprehensive analytical testing, including HPLC for purity and strength assessment, to ensure consistent performance and compliance with industry specifications. A detailed Certificate of Analysis (COA) is provided with each shipment to guarantee traceability and quality assurance for our global B2B clients.

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 and moisture to maintain product integrity.

Specification

Item	Specification
Appearance	Dark Blue Powder
Identification (IR)	Conforms to Standard
Assay (HPLC)	Min. 95%
Color Strength	100 ± 3%
Solubility in Water	Conforms
pH (1% Solution)	6.0 - 8.0
Moisture Content	Max. 5.0%
Ash Content	Max. 1.0%

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