Description

C.I. Reactive Blue 42 is a reactive anthraquinone dye known for its bright blue shade and excellent wash and light fastness properties. It is a critical component for achieving durable and vibrant coloration on cellulosic fibers like cotton, viscose, and linen. This product is essential for textile manufacturers, dye houses, and ink formulators seeking high-performance, covalent-bonding dyes for industrial applications.

Application

• Textile Dyeing: Primary application for exhaust and continuous dyeing of cotton, rayon, and other cellulosic fabrics.
• Textile Printing: Used in printing pastes for creating sharp, wash-fast blue designs on natural fiber textiles.
• Leather Coloring: Imparts durable blue colors to leather goods.
• Paper Staining: Employed for specialty paper coloring where high fastness is required.
• Ink Formulation: A pigment source for certain types of inks requiring a stable blue hue.
• Research & Development: Used as a standard or intermediate in chemical synthesis and dye research laboratories.

Basic Information

Product Name	C.I. Reactive Blue 42
CAS No.	12236-91-8
Molecular Formula	C23H14Cl2N6O8S2
Molecular Weight	637.42 g/mol
Synonyms	Reactive Blue 42; Reactive Blue K-GL; C.I. 61211; Remazol Brilliant Blue R; Levafix Brilliant Blue E-B; Procion Blue H-ERD; Drimarene Brilliant Blue K-2RL; Anthraquinone blue reactive dye; 1-Amino-4-[[3-[(2,5-dichloro-4-methylphenyl)sulfonyl]oxypropyl]amino]-9,10-dihydro-9,10-dioxo-2-anthracenesulfonic acid ester
EINECS	Contact for details

Quality Control

Our production of C.I. Reactive Blue 42 adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance. Every lot is tested for critical parameters including shade, strength, solubility, and fixation rate. A Certificate of Analysis (COA) detailing purity, physical properties, and application test results is provided with each shipment to guarantee it meets your specific technical requirements.

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).

Specification

Item	Specification
Appearance	Dark Blue Powder
Identification (IR)	Conforms
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Solubility	≥ 50 g/L (at 50°C)
pH (1% Solution)	6.0 - 8.0
Fixation Rate	≥ 70%
Dusting Grade	Low-dusting

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