Description

Acid Yellow 40 is a synthetic, water-soluble azo dye belonging to the acid dye class, widely recognized for its bright, vivid yellow color. Its primary value lies in its excellent affinity for protein fibers like wool, silk, and nylon, as well as its use in coloring various industrial products. This dye is essential for manufacturers in the textile, leather, paper, and specialty ink industries seeking consistent, high-quality coloration. Acid Yellow 40 CAS NO 6372-96-9 is known for its good light and wash fastness properties on suitable substrates.

Application

• Textile Dyeing: Primary application for dyeing wool, silk, nylon, and modified acrylic fibers.
• Leather Coloring: Used for dyeing leather goods, providing vibrant and uniform shades.
• Paper Staining: Employed in the production of colored papers, tissues, and specialty packaging.
• Ink Formulation: A colorant for inks used in ballpoint pens, stamp pads, and other stationery.
• Biological Staining: Potential use as a microscopic stain in histology and cytology laboratories.
• Food Contact Materials: May be used for coloring food packaging materials where regulatory compliance is met.
• Cosmetic Additive: Used in some cosmetic formulations like soaps and hair dyes (subject to regional regulations).
• Specialty Coatings: Coloring agent for wood stains, polishes, and other surface coatings.

Basic Information

Product Name	Acid Yellow 40
CAS No.	6372-96-9
Molecular Formula	C16H13N4NaO4S
Molecular Weight	380.35 g/mol
Synonyms	Acid Yellow G; C.I. 18965; C.I. Acid Yellow 40; Acid Leather Yellow G; Acid Fast Yellow G; Wool Yellow G; Lissamine Yellow G; Kiton Yellow G; D&C Yellow No. 10 (when purified to specific grade); Food Yellow 10; Trisodium 5-hydroxy-1-(4-sulfonatophenyl)-4-[(E)-(4-sulfonatophenyl)diazenyl]-1H-pyrazole-3-carboxylate
EINECS	228-935-2

Quality Control

Our Acid Yellow 40 is manufactured under a strict quality management system. Each batch is tested to ensure it meets specifications for color strength, shade, solubility, and impurity profiles. We provide comprehensive Certificates of Analysis (COA) with each shipment, detailing results for key parameters. Our production adheres to ISO 9001 standards, and the product can be supplied in grades suitable for various industrial applications, with purity levels typically exceeding 85% (as dye content).

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 such as strong oxidizing agents. The product is light-sensitive (store away from light), and prolonged exposure to high humidity should be avoided to prevent caking.

Specification

Item	Specification
Appearance	Yellow to orange-yellow powder
Identification (IR)	Conforms to standard
Assay (Dye Content)	Min. 85%
Moisture Content	Max. 5.0%
Water Insoluble Matter	Max. 0.5%
Shade	Conforms to standard sample
Solubility in Water	Freely soluble
Heavy Metals (as Pb)	Max. 20 ppm
Arsenic (As)	Max. 3 ppm

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