Description

Acid Yellow 128 is a high-performance, synthetic acid dye belonging to the azo chemical class, identified by CAS NO 51053-43-1. This dye is valued for its bright, vivid yellow hue and excellent fastness properties, making it a critical component for achieving durable coloration. It is primarily utilized in industrial applications where strong, lightfast, and wash-resistant colors are required. Key sectors that rely on this product include textile manufacturing, leather processing, and paper coloration.

Application

• Primary dye for nylon, wool, and silk fibers in the textile industry.
• Coloration of leather goods, including footwear, bags, and upholstery.
• Manufacturing of colored paper and specialty paper products.
• Ink formulation for jet printing and specialty inks.
• Dyeing of anodized aluminum for decorative and architectural purposes.
• Potential use as a staining agent in biological and laboratory applications.

Basic Information

Product Name	Acid Yellow 128
CAS No.	51053-43-1
Molecular Formula	C16H12N4Na2O8S2
Molecular Weight	506.40 g/mol
Synonyms	Acid Fast Yellow EFC; C.I. Acid Yellow 128; Acid Leather Yellow E-2G; Acid Yellow E-2G; Acid Yellow EFC; Acid Yellow E-2G 200%; 6,8-Dihydroxy-5,7-dinitro-2-naphthalenesulfonic acid disodium salt; Disodium 5,7-dinitro-8-hydroxy-2-naphthalenesulfonate-6-olate
EINECS	256-910-5

Quality Control

Our Acid Yellow 128 is manufactured under a stringent quality management system. Every batch undergoes comprehensive analytical testing to ensure consistent purity, color strength, and application performance. We provide detailed Certificates of Analysis (COA) for all shipments, confirming compliance with agreed specifications. Our quality commitment supports your need for reliable and reproducible results in your production processes.

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). Due to its hygroscopic nature, the container must be kept tightly sealed to prevent moisture absorption, which can affect product performance. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Yellow to orange-yellow powder
Identification (IR)	Conforms to standard
Assay (HPLC)	Min. 95%
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	Max. 5.0%
Water Insoluble Matter	Max. 0.5%
pH (1% Solution)	6.0 - 8.0
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.