Description

Acid Yellow 220 is a synthetic anionic dye belonging to the azo chemical class, valued for its bright and stable yellow hue. This high-performance colorant is engineered to deliver excellent lightfastness and wash fastness on protein-based substrates, ensuring vibrant and durable coloration. It is primarily utilized by manufacturers in the textile, leather, and paper industries seeking reliable and consistent dyeing results for nylon, wool, and silk.

Application

• Textile Dyeing: Primary application for dyeing nylon, wool, and silk fibers, offering good leveling and exhaustion properties.
• Leather Coloring: Used for dyeing leather goods, providing rich and uniform yellow shades with good penetration.
• Paper Staining: Employed in the production of specialty papers, decorative papers, and security papers requiring color fastness.
• Ink Formulation: A component in the manufacture of inks for various printing applications where a stable yellow is required.
• Biological Staining: Potential use as a microscopic stain in histology and cytology for contrast and identification.

Basic Information

Product Name	Acid Yellow 220
CAS No.	70851-34-2
Molecular Formula	C16H13N4NaO4S
Molecular Weight	380.35 g/mol
Synonyms	Acid Yellow 220; C.I. 18995; Acid Leather Yellow G; Nylosan Yellow E-2G; Telon Yellow G; Acid Yellow 2G; Acid Fast Yellow E-2G; 2,7-Naphthalenedisulfonic acid, 5-[(4-aminophenyl)azo]-4-hydroxy-3-[(2-methylphenyl)azo]-, sodium salt (1:1)
EINECS	Contact for details

Quality Control

Our Acid Yellow 220 is produced under a strict quality management system to ensure batch-to-batch consistency and performance. Each lot is tested against key parameters including color strength, shade, solubility, and impurity profile. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and conformance to specification is available for every shipment.

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. The product is light-sensitive and should be stored away from direct light exposure to maintain stability.

Specification

Item	Specification
Appearance	Yellow to orange powder
Identification (IR)	Conforms to standard
Assay (HPLC)	Min. 95%
Color Strength	100 ± 3%
Moisture Content	Max. 5.0%
Water Solubility	Conforms
Ash Content	Max. 0.5%
Heavy Metals (as Pb)	Max. 20 ppm

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