Description

Acid Yellow 220 is a synthetic organic dye belonging to the azo chemical class, widely recognized for its bright and stable yellow hue. This high-performance colorant is valued for its excellent lightfastness, wash fastness, and strong affinity for protein-based and polyamide fibers. It is an essential component for manufacturers in the textile, leather, and paper industries seeking vibrant, durable coloration. Its reliable performance under acidic dyeing conditions makes it a preferred choice for specialized applications requiring consistent quality.

Application

• Textile Dyeing: Primary application for dyeing wool, silk, and nylon fibers, providing excellent levelness and color yield.
• Leather Coloring: Used in the dyeing of leather goods, offering good penetration and uniform color.
• Paper Staining: Employed for coloring specialty papers, including decorative and packaging materials.
• Ink Formulation: A key pigment for manufacturing inks, particularly for ballpoint pens and other writing instruments.
• Biological Staining: Potential use in histological and microbiological staining procedures in laboratory settings.
• Plastics and Polymers: Can be used for coloring certain types of plastics and synthetic materials.

Basic Information

Product Name	Acid Yellow 220
CAS No.	71603-79-7
Molecular Formula	C16H13N4NaO4S
Molecular Weight	380.35 g/mol
Synonyms	Acid Yellow 220; C.I. 18995; Acid Leather Yellow G; Acid Fast Yellow G; Acid Yellow G; Acid Yellow 2G; Acid Yellow GG; 2,7-Naphthalenedisulfonic acid, 5-(acetylamino)-4-hydroxy-3-(phenylazo)-, monosodium salt
EINECS	Contact for details

Quality Control

Our Acid Yellow 220 is manufactured under a stringent quality management system to ensure batch-to-batch consistency and high purity. Each lot is tested against rigorous internal specifications for parameters such as color strength, shade, solubility, and impurity profile. While this product is typically supplied to industrial grade standards, we can provide material compliant with specific customer requirements. A Certificate of Analysis (COA) detailing all test results 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). This material is hygroscopic (moisture-sensitive); therefore, the container must be kept tightly sealed when not in use to prevent absorption of atmospheric moisture, which can affect performance.

Specification

Item	Specification
Appearance	Yellow to orange-yellow powder
Identification (IR)	Conforms to standard
Color Strength	100 ± 3% (vs. Standard)
Shade	Conforms to standard
Moisture Content	≤ 5.0%
Water Solubility	Conforms
Ash Content	≤ 1.0%
Particle Size	≥ 95% passes 80 mesh

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