Description

Levafix Green E-Fb is a high-performance, reactive dye belonging to the vinyl sulfone class, widely recognized for its excellent color fastness and brilliant green hue. This product is engineered to deliver superior dyeing and printing results on cellulosic fibers, offering outstanding wash and light fastness properties. It is an essential component for textile manufacturers, leather processors, and industrial colorant producers seeking reliable and vibrant green shades for their products.

Application

• Textile Dyeing and Printing: Primary application for dyeing cotton, viscose, linen, and other cellulosic fibers in exhaust, pad-batch, and continuous dyeing processes.
• Leather Coloring: Used for dyeing leather goods, providing rich and even coloration with good fastness.
• Industrial Colorants: Serves as a key intermediate or colorant in the production of inks, pigments, and specialty coatings.
• Research & Development: Utilized in chemical research and analytical laboratories as a reference standard or for developing new dye formulations.

Basic Information

Product Name	Levafix Green E-Fb
CAS No.	51731-73-8
Molecular Formula	C29H20ClN7O10S2·2Na
Molecular Weight	Contact for details
Synonyms	Reactive Green 19; C.I. Reactive Green 19; Levafix Green E-FB; Remazol Green 19; Drimarene Green E-FB; Sumifix Green E-FB; Reactive Green KE4B; Dinazol Green 19; 1,3,6-Naphthalenetrisulfonic acid, 8-[[4-[[4-chloro-6-[(3-sulfophenyl)amino]-1,3,5-triazin-2-yl]amino]-2-sulfophenyl]azo]-7-hydroxy-, trisodium salt
EINECS	257-357-7

Quality Control

Our Levafix Green E-Fb is produced under a stringent quality management system to ensure batch-to-batch consistency and performance. Each lot is tested against rigorous internal specifications for critical parameters such as color strength, shade, solubility, and fastness properties. Certificates of Analysis (COA) documenting purity, physical properties, and performance characteristics are available for every shipment to support your quality assurance protocols.

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. Due to its light-sensitive nature, prolonged exposure to direct light should be avoided to maintain product stability.

Specification

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

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