Description

Acid Yellow 143 is a synthetic anionic dye belonging to the azo chemical class, valued for its bright, stable yellow hue and excellent affinity for protein-based fibers. Its primary commercial value lies in providing consistent, vibrant coloration with good fastness properties in demanding industrial applications. This dye is essential for manufacturers in the textile, leather, and paper industries seeking reliable and cost-effective coloring solutions for nylon, wool, and silk.

Application

• Textile Dyeing: Primary application for dyeing nylon, wool, silk, and other protein fibers to achieve bright yellow shades.
• Leather Finishing: Used for coloring leather goods, providing uniform and penetrating coloration.
• Paper Staining: Employed in the production of colored papers, specialty tissues, and decorative paper products.
• Ink Formulation: A component in the manufacture of inks for various printing applications.
• Biological Staining: Potential use as a stain in microscopy and histology for biological tissues.
• Specialty Chemical Intermediate: Serves as a precursor or colorant in the synthesis of more complex chemical products.

Basic Information

Product Name	Acid Yellow 143
CAS No.	12220-78-9
Molecular Formula	C16H13N4NaO4S
Molecular Weight	380.35 g/mol
Synonyms	Acid Yellow G; C.I. Acid Yellow 143; Acid Leather Yellow G; Nylosan Yellow E-G; Telon Yellow G; Lissamine Yellow G; Acid Fast Yellow G; 7-Hydroxy-8-[(E)-(4-sulfonatophenyl)diazenyl]naphthalene-1,3-disulfonic acid trisodium salt
EINECS	Contact for details

Quality Control

Our Acid Yellow 143 is manufactured under a stringent quality management system to ensure batch-to-batch consistency and performance reliability. 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 provided with every shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, 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
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.