Description

C.I. Reactive Red 28 is a highly reactive, water-soluble azo dye belonging to the vinyl sulfone class of reactive dyes. Its primary value lies in forming strong covalent bonds with cellulose fibers, resulting in exceptional wash and light fastness properties. This product is essential for textile manufacturers and dye houses specializing in the coloration of cotton, viscose, and other cellulosic materials, as well as for research and development in advanced dye chemistry.

Application

• Exhaust Dyeing of Cellulosic Fibers: Primary application for dyeing cotton, rayon, linen, and hemp in batch processes.
• Continuous Dyeing: Used in pad-batch, pad-steam, and pad-dry thermofix processes for fabrics.
• Yarn Dyeing: Coloration of cellulosic yarns for weaving and knitting applications.
• Garment Dyeing: Suitable for dyeing finished cotton garments to achieve vibrant red shades.
• Ink Formulation: Potential use in the formulation of specialty inks for textile printing.
• Research & Development: Serves as a key intermediate or reference standard in chemical and textile research.

Basic Information

Product Name	C.I. Reactive Red 28
CAS No.	12218-06-3
Molecular Formula	C25H14Cl2N6Na4O16S4
Molecular Weight	977.66 g/mol
Synonyms	Reactive Red 28; Reactive Red VS-R; Remazol Red RB; Levafix Red E-4BA; Procion Red H-8BN; C.I. 18105; Vinylsulfone Reactive Red; 2,7-Naphthalenedisulfonic acid, 5-[[4-chloro-6-[(3-sulfophenyl)amino]-1,3,5-triazin-2-yl]amino]-4-hydroxy-3-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]azo]-, tetrasodium salt
EINECS	Contact for details

Quality Control

Our production of C.I. Reactive Red 28 adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance. Every lot is tested against key parameters including color strength, solubility, fixation rate, and impurity profile. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and application performance 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 ambient temperature (15-25°C). Keep away from strong oxidizing agents. The product is hygroscopic (moisture-sensitive); ensure the original container is properly sealed after use to prevent moisture absorption and caking.

Specification

Item	Specification
Appearance	Reddish-brown powder
Identification (IR)	Conforms to standard
Color Strength	100 ± 3% (vs. Standard)
Assay (HPLC)	≥ 95.0%
Water Content (KF)	≤ 5.0%
Solubility in Water	≥ 100 g/L (at 50°C)
pH (1% Solution)	6.0 - 8.0
Fixation Rate	≥ 70% (on cotton)

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