Description

Acid Red 66 is a synthetic, water-soluble azo dye belonging to the acid dye class, valued for its bright and vivid red color. It is a critical component for imparting durable and wash-fast coloration to protein-based and polyamide fibers. This dye is essential for manufacturers in the textile, leather, and paper industries seeking consistent, high-quality red shades for their products. Acid Red 66 CAS NO 4196-99-0 is known for its good leveling properties and compatibility with standard dyeing processes.

Application

Acid Red 66 is a versatile dye with primary applications in industries requiring strong, permanent coloration of materials with amino groups. Its key uses include:

• Textile Dyeing: Primary application for dyeing natural protein fibers like wool, silk, and synthetic polyamide fibers such as nylon.
• Leather Finishing: Used for coloring leather goods, providing rich and uniform shades.
• Paper Coloration: Employed in the production of specialty colored papers and paper products.
• Ink Formulation: A component in the manufacture of inks for various printing applications.
• Biological Staining: Potential use as a histological stain in laboratory settings.
• Cosmetics: Used in certain hair dyes and other cosmetic colorants where approved.

Basic Information

Product Name	Acid Red 66
CAS No.	4196-99-0
Molecular Formula	C18H14N3NaO3S
Molecular Weight	375.38 g/mol
Synonyms	Acid Red 66; C.I. 26905; Acid Leather Red BG; Naphthalene Scarlet 4R; Acid Fast Red A; Eosine G; Acid Brilliant Red 3B; 7-Hydroxy-8-[(E)-phenyldiazenyl]naphthalene-1,3-disulfonic acid sodium salt
EINECS	224-083-4

Quality Control

Our Acid Red 66 is manufactured under a strict quality management system to ensure batch-to-batch consistency and performance. Each lot is tested against stringent in-house specifications for critical parameters such as color strength, shade, solubility, and impurity profile. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and conformance is provided with every shipment to support your quality assurance protocols.

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 incompatible materials and sources of heat. Due to its light-sensitive nature, prolonged exposure to direct light should be avoided to maintain product integrity.

Specification

Item	Specification
Appearance	Red to dark red powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Solubility	Clear solution at 1%
Ash Content	≤ 1.0%

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