Description

Vat Yellow 31 is a high-performance vat dye belonging to the anthraquinone chemical class, known for its excellent color fastness and stability. This compound is particularly valued for its ability to produce vibrant, durable yellow shades that resist fading from light, washing, and perspiration. It is an essential pigment for industrial manufacturers requiring long-lasting coloration in demanding environments. Key industries that utilize this product include textile dyeing, specialty inks, and high-grade plastics.

Application

• Primary application in the vat dyeing of cotton, linen, and viscose fibers for textiles.
• Used in the coloration of technical textiles requiring high lightfastness and washfastness, such as awnings, tents, and workwear.
• Formulation of specialty inks for security printing, packaging, and artistic applications.
• Pigmentation of engineering plastics and synthetic fibers where color stability under heat and UV exposure is critical.
• Manufacturing of leather dyes for high-quality finished leather goods.
• Potential use as an intermediate or colorant in the synthesis of other specialty chemicals and pigments.

Basic Information

Product Name	Vat Yellow 31
CAS No.	6871-93-8
Molecular Formula	C28H12N2O4
Molecular Weight	440.41 g/mol
Synonyms	C.I. Vat Yellow 31; Vat Yellow 4GF; C.I. 70800; 8,16-Pyranthrenedione, 5,10-dihydro-5,10-dioxo-; Dibenzanthrone; Flavanthrone Yellow; Pyranthrone; C.I. Pigment Yellow 108 (when used as pigment); Flavanthrone
EINECS	229-975-2

Quality Control

Our Vat Yellow 31 is manufactured under a stringent quality management system to ensure batch-to-batch consistency and performance reliability. The product undergoes comprehensive testing, including purity assay, shade strength evaluation, and tests for specific impurities relevant to its dyeing performance. Certificates of Analysis (COA) documenting key parameters such as color value, particle size distribution, and solubility are provided with 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 a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept sealed when not in use to prevent absorption of atmospheric moisture, which can affect product performance. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Yellow to orange powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Color Strength	100 ± 5% (vs. Standard)
Moisture Content	≤ 2.0%
Ash Content	≤ 1.0%
Particle Size (≥95%)	≤ 10 µm
Solubility in DMSO	Complete solution

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