Description

Acid Yellow 4R is a synthetic organic dye belonging to the azo class, widely recognized for its bright and stable yellow hue. It is valued for its excellent color fastness, solubility, and compatibility in various industrial dyeing and printing processes. This high-performance colorant is essential for manufacturers in the textile, leather, and paper industries seeking vibrant and durable yellow shades.

Application

• Primary dyeing and printing of polyamide (nylon) fibers and textiles.
• Coloration of leather goods, providing rich and even shades.
• Manufacturing of colored paper and paper products.
• As a colorant for inks used in various printing applications.
• Dyeing of silk and wool fibers.
• Potential use in the coloration of plastics and other polymers.

Basic Information

Product Name	Acid Yellow 4R
CAS No.	12715-61-6
Molecular Formula	C16H13N4NaO4S
Molecular Weight	380.35 g/mol
Synonyms	Acid Yellow R; C.I. Acid Yellow 42; Acid Fast Yellow EFC; Acid Leather Yellow R; Acidol Yellow M-RL; Amacid Yellow R; Derma Yellow R; Lissamine Yellow R; Supranol Yellow R; Tectilon Yellow 4R
EINECS	Contact for details

Quality Control

Our Acid Yellow 4R is manufactured under a stringent 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. Certificates of Analysis (COA) documenting purity and conformance to agreed specifications are available upon request.

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.

Specification

Item	Specification
Appearance	Yellow to orange powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 95%
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Solubility	Conforms
Ash Content	≤ 1.0%

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