Description

Vat Yellow 33 is a high-performance vat dye belonging to the anthraquinone chemical class, known for its excellent color fastness and stability. This product is essential for achieving durable and vibrant yellow shades on cellulosic fibers like cotton and viscose. It is a critical raw material for textile manufacturers, leather dyers, and specialty ink producers who require superior light and wash fastness in their finished products.

Application

• Textile Dyeing: Primary application for dyeing cotton, linen, and viscose yarns and fabrics to achieve brilliant, fast yellow colors.
• Leather Coloring: Used in the dyeing of leather goods, providing rich and durable yellow hues.
• Specialty Inks: A key pigment for manufacturing high-quality printing inks where color permanence is required.
• Paper Staining: Employed for coloring high-grade papers and specialty packaging materials.
• Pigment Preparation: Serves as a base for producing high-performance organic pigments used in plastics and coatings.
• Denim Yarn Dyeing: Ideal for producing classic and fashion yellow shades in denim and other heavy-duty fabrics.

Basic Information

Product Name	Vat Yellow 33
CAS No.	12227-50-8
Molecular Formula	C28H12N2O4
Molecular Weight	440.41 g/mol
Synonyms	Vat Yellow 33; C.I. Vat Yellow 33; C.I. 65429; Flavanthrone Yellow; Indanthren Yellow G; Cibanone Yellow G; Caledon Yellow G; Solanthrene Yellow J; Mikethrene Yellow G; 8,16-Pyranthrenedione, 5,9-dihydro-
EINECS	235-426-4

Quality Control

Our Vat Yellow 33 is manufactured under a strict quality management system. Every batch is tested to ensure it meets high-purity standards and consistent performance characteristics, including shade, strength, and fastness properties. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and application test results is provided with each shipment to guarantee product integrity and traceability.

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.

Specification

Item	Specification
Appearance	Yellow to orange powder
Identification (IR)	Conforms to standard
Color Strength	100 ± 3% (vs. Standard)
Shade	Conforms to standard
Purity (HPLC)	≥ 96.0%
Moisture Content	≤ 1.0%
Ash Content	≤ 0.5%
Particle Size	≥ 95% passes 80 mesh
Fastness Properties (Cotton)	Light: 6-7; Wash: 4-5; Rubbing: 4-5

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