Description

Acid Yellow 25:1 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 and strong affinity to various substrates, ensuring consistent and durable coloration. It is primarily used by manufacturers in the textile, leather, and paper industries seeking reliable and vibrant yellow shades for their products.

Application

• Primary dyeing and printing of polyamide (nylon) fibers and wool.
• Coloration of leather goods, providing rich and uniform yellow tones.
• Manufacturing of colored paper and paper products.
• As a colorant for inks and toners in specific printing applications.
• Potential use in the coloration of soaps and detergents.
• Research and development applications in analytical chemistry as a pH indicator or stain.

Basic Information

Product Name	Acid Yellow 25:1
CAS No.	67015-89-8
Molecular Formula	C16H13N4NaO4S
Molecular Weight	380.35 g/mol
Synonyms	Acid Yellow 25, Calcium Salt; C.I. Acid Yellow 25:1; Acid Leather Yellow EG; Nylosan Yellow E-2G; Acid Fast Yellow EG; Yellow 2G; 5-Amino-4-hydroxy-3-(phenyldiazenyl)naphthalene-2,7-disulfonic acid calcium salt; 2,7-Naphthalenedisulfonic acid, 5-amino-4-hydroxy-3-(2-phenyldiazenyl)-, calcium salt (1:1)
EINECS	Contact for details

Quality Control

Our Acid Yellow 25:1 is manufactured under a strict quality management system to ensure batch-to-batch consistency and performance. Each lot is tested against stringent specifications for color strength, shade, solubility, and impurity profiles. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and performance metrics is provided with every shipment to guarantee it meets your application requirements.

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 (moisture-sensitive) nature, the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect product 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	≤ 30.0%
Heavy Metals (as Pb)	≤ 20 ppm

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