Description

C.I. Acid Orange 129 is a synthetic acid dye belonging to the azo dye class, identified by CAS NO 61968-03-4. This high-performance dye is valued for its bright, vivid orange hue and strong affinity for protein fibers like wool, silk, and nylon. It is primarily utilized by manufacturers in the textile, leather, and paper industries seeking consistent, wash-fast coloration. The product is supplied as a high-purity powder, ensuring reliable batch-to-batch performance for industrial dyeing and printing processes.

Application

This acid dye is engineered for a range of industrial coloring applications where durability and color fastness are critical.

• Textile Dyeing: Primary application for dyeing wool, silk, and nylon fibers and fabrics to achieve bright orange shades.
• Leather Coloring: Used in the dyeing of leather goods, providing good penetration and color uniformity.
• Paper Staining: Employed for the coloration of specialty papers, including decorative and packaging materials.
• Ink Formulation: A colorant component in the manufacture of inks for various printing applications.
• Biomedical Staining: Potential use as a biological stain in laboratory and histological settings.

Basic Information

Product Name	C.I. Acid Orange 129
CAS No.	61968-03-4
Molecular Formula	C32H24N8Na2O8S2
Molecular Weight	758.68 g/mol
Synonyms	Acid Orange 129; Acid Orange A; C.I. 19172; Acid Leather Orange A; Acid Fast Orange A; Sodium 4,4'-(1,3,4-thiadiazole-2,5-diyl)bis(5-hydroxy-7-sulfo-2-naphthylazo)dibenzoate; 2-Naphthalenesulfonic acid, 7,7'-(1,3,4-thiadiazole-2,5-diyl)bis(2-hydroxy-5-((2-sulfophenyl)azo)-, disodium salt
EINECS	Contact for details

Quality Control

Our C.I. Acid Orange 129 is manufactured under a strict quality management system. Every batch is tested to ensure it meets precise specifications for color strength, shade, solubility, and impurity levels. We provide comprehensive Certificates of Analysis (COA) with each shipment, detailing key parameters such as assay, moisture content, and heavy metal limits. Our quality commitment ensures the consistency and reliability required for your industrial processes.

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. 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
Color Strength	100 ± 3% (vs. 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.