Description

Acid Yellow 156 is a synthetic anionic dye belonging to the acid dye class, widely recognized for its bright, vivid yellow color. This high-performance colorant is valued for its excellent lightfastness, washfastness, and strong affinity for protein-based and polyamide fibers. It is an essential component for manufacturers in the textile, leather, and paper industries seeking durable and vibrant coloration. Acid Yellow 156 CAS NO 12220-82-5 is also utilized in specialized applications requiring precise and stable yellow hues.

Application

Acid Yellow 156 is a versatile dye with primary applications in industries requiring durable coloration of natural and synthetic materials. Its key uses include:

• Textile Dyeing: Primary application for dyeing wool, silk, and nylon fibers, providing excellent color yield and fastness properties.
• Leather Finishing: Used for coloring leather goods, offering rich, uniform shades with good rub resistance.
• Paper Coloration: Employed in the production of specialty papers, decorative papers, and security papers.
• Ink Formulation: A key pigment for inks used in jet printing, flexography, and other marking applications.
• Biological Staining: Potential use as a stain in microscopy and histology for contrast and identification.
• Plastics and Polymers: For coloring certain types of plastics where acid dye compatibility exists.

Basic Information

Product Name	Acid Yellow 156
CAS No.	12220-82-5
Molecular Formula	C16H12N4Na2O7S2
Molecular Weight	478.40 g/mol
Synonyms	Acid Yellow 156; C.I. Acid Yellow 156; 2,2'-(1,2-Ethenediyl)bis[5-[(4-sulfophenyl)azo]benzenesulfonic acid] disodium salt; Acid Leather Yellow AGL; Nylon Fast Yellow FGL; Supranol Yellow GW; Telon Yellow FGL; Acid Fast Yellow A-GL
EINECS	Contact for details

Quality Control

Our production of Acid Yellow 156 adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance reliability. Every lot is tested against comprehensive specifications for color strength, shade, solubility, and impurity profile. Certificates of Analysis (COA) documenting purity, physical properties, and conformance to agreed specifications are provided with each shipment. We support compliance with relevant global standards for industrial dyes.

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. The product is light-sensitive (store away from light).

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 Insoluble Matter	≤ 0.5%
Assay (HPLC)	≥ 95.0%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility in Water	Clear solution

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