Description

Vat Blue 4B is a high-performance vat dye belonging to the indanthrone chemical class, known for its exceptional color fastness and brilliant blue shade. Its primary value lies in delivering superior wash, light, and chlorine resistance, making it a critical component for durable and high-quality coloration. This pigment is essential for manufacturers in the textile, ink, and specialty coatings industries who require a stable and vivid blue colorant for demanding applications. We supply Vat Blue 4B (CAS No. 2475-31-2) in consistent quality to meet global industrial standards.

Application

• Textile Dyeing and Printing: Primary application for dyeing cotton, wool, and viscose fibers, valued for its excellent fastness properties in apparel and home textiles.
• Pigment for Inks: Used in the formulation of high-quality printing inks, including textile printing inks, where color stability is paramount.
• Specialty Coatings: Employed as a colorant in industrial and artistic paints and coatings that require resistance to fading.
• Plastics and Masterbatch: Suitable for coloring certain plastics where high temperature stability and lightfastness are needed.
• Paper Coloring: Used for specialty paper products requiring a fast blue color.
• Leather Dyeing: Applied in the dyeing of leather goods to achieve durable blue shades.

Basic Information

Product Name	Vat Blue 4B
CAS No.	2475-31-2
Molecular Formula	C₂₈H₁₄N₂O₄
Molecular Weight	442.42 g/mol
Synonyms	Vat Blue 4B; C.I. Vat Blue 4B; C.I. 69800; Indanthrene Blue 4B; Indanthrone; 16,17-Dihydrodinaphtho[2,3-a:2',3'-i]phenazine-5,9,14,18-tetrone; Cl 69800; Vat Blue 4BD
EINECS	219-604-7

Quality Control

Our Vat Blue 4B is manufactured under a strict quality management system to ensure batch-to-batch consistency and compliance with industry specifications. Each lot is tested against key parameters including color strength, shade, and purity. A Certificate of Analysis (COA) detailing the results for identity, assay, and impurity profiles is provided with every shipment to guarantee product integrity for your processes.

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 and should be stored away from direct light exposure to maintain stability.

Specification

Item	Specification
Appearance	Dark Blue Powder
Identification (IR)	Conforms
Color Strength	100 ± 3% (Standard)
Shade	Matches Standard
Moisture Content	≤ 1.0%
Ash Content	≤ 1.0%
Particle Size (Passing 80 mesh)	≥ 95%
Solubility	Practically insoluble in water; soluble in concentrated sulfuric acid

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