Description

Acid Orange 51 is a synthetic organic dye belonging to the azo dye class, widely recognized for its vibrant orange hue. It is valued for its strong color strength and good solubility in aqueous systems, making it a reliable and efficient coloring agent. This product is essential for manufacturers in the textile, leather, and paper industries seeking consistent and high-quality dyeing results. Its specific chemical structure ensures good fastness properties in various applications.

Application

• Textile Dyeing: Primary application for dyeing protein fibers like wool, silk, and nylon to achieve bright orange shades.
• Leather Coloring: Used in the dyeing and finishing of leather goods, providing rich and uniform color.
• Paper Staining: Employed for coloring paper products, including specialty papers and packaging materials.
• Ink Formulation: A component in the manufacture of inks for various printing applications.
• Biological Staining: Potential use as a histological stain in laboratory settings for microscopic analysis.
• Plastics and Polymers: Can be used for coloring certain types of plastics and synthetic materials.

Basic Information

Product Name	Acid Orange 51
CAS No.	8003-88-1
Molecular Formula	C16H11N4NaO4S
Molecular Weight	378.34 g/mol
Synonyms	Acid Orange A; C.I. Acid Orange 51; Acid Leather Orange A; Acid Orange AS; Acid Orange II (related but verify); 5-[(2,4-Dinitrophenyl)azo]salicylic acid sodium salt; Sodium 5-[(2,4-dinitrophenyl)azo]salicylate; Dinitrosalicylyl Orange
EINECS	Contact for details

Quality Control

Our Acid Orange 51 is manufactured under a strict quality management system to ensure batch-to-batch consistency and reliability. Each lot undergoes comprehensive analytical testing, including identification, purity assay, and impurity profiling. A Certificate of Analysis (COA) detailing all test results is provided with every shipment to guarantee the product meets your technical 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). Keep away from incompatible materials such as strong oxidizing agents. Due to its light-sensitive nature, prolonged exposure to direct light should be avoided to maintain product integrity.

Specification

Item	Specification
Appearance	Orange to reddish-brown powder
Identification (IR)	Conforms to standard
Assay (HPLC)	Min. 95%
Water Solubility	Freely soluble
Loss on Drying	Max. 5.0%
Ash Content (Sulfated)	Max. 1.0%
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.