Description

C. I. Acid Yellow 18 is a synthetic, water-soluble monoazo acid dye widely recognized for its bright, greenish-yellow hue. It is valued for its strong tinctorial strength and good leveling properties, making it a reliable and cost-effective coloring agent for various substrates. This dye is essential for manufacturers in the textile, leather, and paper industries seeking consistent and vibrant coloration.

Application

• Textile Dyeing: Primarily used for dyeing protein fibers like wool, silk, and nylon, as well as for printing on these materials.
• Leather Finishing: Employed in the dyeing of leather goods to achieve uniform and durable yellow shades.
• Paper Coloring: Used in the production of colored papers, tissues, and specialty paper products.
• Ink Formulation: A component in the manufacture of inks for writing, printing, and marking.
• Biological Staining: Finds application as a histological stain in laboratory settings for microscopic analysis.
• Other Industrial Uses: Can be used for coloring soaps, detergents, and other commodity chemicals where acid-fastness is required.

Basic Information

Product Name	C. I. Acid Yellow 18
CAS No.	6359-54-2
Molecular Formula	C16H13N3Na2O7S2
Molecular Weight	477.40 g/mol
Synonyms	Acid Yellow GG; Acid Leather Yellow GG; Acid Fast Yellow GG; Acid Yellow 2G; C.I. 18965; Food Yellow 5 (in some contexts); Lissamine Yellow 2G; Wool Yellow GG; 6-Hydroxy-5-[(4-sulfophenyl)azo]-2-naphthalenesulfonic acid disodium salt; 2-Naphthalenesulfonic acid, 6-hydroxy-5-((4-sulfophenyl)azo)-, disodium salt
EINECS	228-787-8

Quality Control

Our C. I. Acid Yellow 18 is manufactured under a strict quality management system. Each batch is tested to ensure it meets consistent specifications for color strength, shade, solubility, and impurity profile. While produced to industrial grade standards, we can discuss compliance with specific buyer requirements. A Certificate of Analysis (COA) detailing purity, physical properties, and performance tests is provided with every shipment.

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). This product is hygroscopic (moisture-sensitive); keep the container tightly sealed when not in use to prevent caking or degradation due to absorbed moisture.

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)	≥ 85% (Pure dye content)
Solubility in Water	Clear solution at 1%
pH (1% Solution)	6.0 - 8.0

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