Description

Acid Orange 156 is a synthetic organic dye belonging to the azo dye class, valued for its vibrant orange hue and good fastness properties. This high-performance dye is engineered for demanding applications where consistent color strength and stability are critical. It is primarily used by manufacturers in the textile, leather, and specialty paper industries seeking reliable and efficient coloring agents.

Application

• Textile Dyeing: Primary application for dyeing protein fibers like wool and silk, as well as polyamide (nylon) fibers, offering good wash and light fastness.
• Leather Finishing: Used for coloring leather goods, providing rich and uniform shades for footwear, apparel, and upholstery.
• Paper Staining: Employed in the production of specialty papers, decorative papers, and security papers requiring specific color markings.
• Ink Formulation: A colorant 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 mass coloration of certain plastics where compatibility is confirmed.

Basic Information

Product Name	Acid Orange 156
CAS No.	68555-86-2
Molecular Formula	C32H24N8Na2O8S2
Molecular Weight	774.75 g/mol
Synonyms	Acid Orange AG; C.I. Acid Orange 156; Acid Fast Orange AG; Sodium 4,4'-[carbonylbis(imino-4,1-phenylenecarbonylimino)]bis[5-hydroxy-6-(phenylazo)naphthalene-2,7-disulphonate]; 2,7-Naphthalenedisulfonic acid, 4,4'-[carbonylbis[imino(4,1-phenylenecarbonylimino)]]bis[5-hydroxy-6-(2-phenyldiazenyl)-, sodium salt (1:2); Amacid Orange R; Derma Orange P-RL; Telon Orange RL
EINECS	Contact for details

Quality Control

Our Acid Orange 156 is produced under a strict quality management system. Every batch undergoes comprehensive analytical testing, including spectrophotometric analysis for strength and shade, HPLC for purity profile, and tests for insolubles and heavy metals. A Certificate of Analysis (COA) detailing batch-specific results is provided to ensure traceability and compliance with your specifications.

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). Due to its hygroscopic nature, the container must be kept tightly sealed after use to prevent moisture absorption, which can affect performance. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Orange to reddish-brown powder
Identification (IR)	Conforms to standard
Color Strength	100 ± 3% (vs. Standard)
Shade	Conforms to standard
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 0.5%
Heavy Metals (as Pb)	≤ 50 ppm
Solubility (in Water)	Clear solution

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