Description

C.I.Acid Orange 43 is a synthetic, water-soluble azo dye belonging to the acid dye class, identified by CAS NO 12217-31-1. It is valued for its bright, vivid orange hue and its strong affinity for protein-based fibers like wool, silk, and nylon, ensuring excellent colorfastness. This dye is essential for manufacturers in the textile, leather, and paper industries seeking reliable and consistent coloration for their products.

Application

• Primary dyeing and printing of wool, silk, and nylon textiles.
• Coloration of leather goods, including footwear, apparel, and accessories.
• Production of colored paper and specialty paper products.
• Manufacturing of inks for inks and toners.
• Staining and coloring for biological and histological applications in laboratories.
• As a colorant for soaps, detergents, and cosmetics where acid-stable dyes are required.

Basic Information

Product Name	C.I.Acid Orange 43
CAS No.	12217-31-1
Molecular Formula	C16H11N4NaO4S
Molecular Weight	378.34 g/mol
Synonyms	Acid Orange 43; Acid Orange A; C.I. 22195; Acid Leather Orange G; Wool Orange A; Naphthalene Orange G; Acid Fast Orange A; 7-Hydroxy-8-[(E)-(4-sulfonatophenyl)diazenyl]naphthalene-1,3-disulfonic acid trisodium salt
EINECS	Contact for details

Quality Control

Our production of C.I.Acid Orange 43 adheres to stringent quality management protocols. Every batch is tested to ensure consistent strength, shade, and chemical purity, meeting the high standards required for industrial dyeing applications. A comprehensive Certificate of Analysis (COA) detailing purity, absorbance, and solubility is provided with each shipment to guarantee product integrity and performance.

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 and incompatible materials.

Specification

Item	Specification
Appearance	Orange to reddish-brown powder
Identification (IR)	Conforms to standard
Assay (HPLC)	Min. 95%
Water Solubility	Freely soluble
Moisture Content	Max. 5.0%
Ash Content	Max. 0.5%
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.