Description

C.I. Vat Blue 35 is a high-performance, synthetic vat dye belonging to the indanthrone chemical class. It is valued for its exceptional color fastness properties, particularly to light, washing, and chlorine, making it a critical component for demanding textile applications. This pigment is primarily used by manufacturers in the textile industry for dyeing and printing cellulosic fibers like cotton, as well as for coloring paper and leather. The compound is also identified by the CAS registry number 84-40-2.

Application

C.I. Vat Blue 35 is a versatile colorant used across several industrial sectors. Its primary and related applications include:

• Textile Dyeing: The predominant use is for dyeing cellulosic fibers such as cotton, linen, and viscose rayon, producing deep, fast blue shades.
• Textile Printing: Employed in printing pastes for fabrics, offering excellent sharpness and durability of the printed design.
• Paper Coloring: Used in the mass coloration of paper products where high lightfastness is required.
• Leather Finishing: Applied in the dyeing of leather goods to achieve consistent and fast blue colors.
• Pigment Manufacturing: Can be processed into pigment forms for use in inks, paints, and plastics, though this is less common than its textile use.

Basic Information

Product Name	C.I. Vat Blue 35
CAS No.	84-40-2
Molecular Formula	C28H14N2O4
Molecular Weight	442.42 g/mol
Synonyms	Vat Blue 35; C.I. 69835; Indanthrone; Indanthrene Blue RS; C.I. Pigment Blue 64; 6,15-Dihydro-5,9,14,18-anthrazinetetrone; Cl 69835; Indanthrene Blue RSN
EINECS	201-538-5

Quality Control

Our production of C.I. Vat Blue 35 adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance reliability. Every lot is tested against key parameters including color strength, shade, particle size distribution, and purity. A comprehensive Certificate of Analysis (COA) detailing these results is provided with each shipment. Our quality system is designed to meet the demanding specifications of global industrial customers.

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 heat sources and incompatible materials. 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 to Standard
Color Strength	100% ± 3% (vs. Standard)
Shade	Within agreed tolerance
Moisture Content	≤ 5.0%
Particle Size (Residue on 80 mesh)	≤ 5.0%
Dyeing Fastness (Cotton)	Light: 7-8 Washing: 4-5 Rubbing: 4-5

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