Description

Basic Orange 21 is a cationic (basic) dye belonging to the azo class, widely recognized for its vibrant orange hue. This compound is valued for its strong affinity to polyacrylonitrile fibers and certain modified polyesters, providing excellent colorfastness and leveling properties. It is primarily utilized in the textile industry for dyeing and printing, as well as in the coloration of paper and leather. Our supply of Basic Orange 21 CAS NO 3056-93-7 ensures consistent quality and reliable performance for industrial applications.

Application

• Primary dyeing agent for acrylic fibers (polyacrylonitrile) and modacrylics.
• Printing applications on textile fabrics to achieve sharp, bright orange patterns.
• Coloration of paper products, including specialty and decorative papers.
• Dyeing of leather goods to provide uniform and durable color.
• Used in the manufacture of inks and toners for specific printing technologies.
• Potential applications in the coloration of plastics and other polymeric materials.
• As a biological stain in laboratory and microscopy settings (subject to specific purity grades).

Basic Information

Product Name	Basic Orange 21
CAS No.	3056-93-7
Molecular Formula	C12H13ClN4
Molecular Weight	248.71 g/mol
Synonyms	Basic Orange 21; C.I. 48035; Aizen Cathilon Orange GLH; Astrazon Orange G; Maxilon Orange GRL; Sevron Orange L; Cationic Orange G; 1,3,3-Trimethyl-2-[(E)-2-(1,3,3-trimethylindolin-2-ylidene)ethylidene]indolium chloride; 2-[(E)-2-(1,3,3-Trimethylindolin-2-ylidene)ethylidene]-1,3,3-trimethylindolium chloride
EINECS	221-285-5

Quality Control

Our Basic Orange 21 is produced under strict quality management protocols. Each batch undergoes comprehensive analytical testing to ensure it meets precise specifications for color strength, purity, and application performance. A detailed Certificate of Analysis (COA) is provided with every shipment, documenting key parameters such as assay, shade, solubility, and impurity profiles. We are committed to supplying material that delivers consistent, reliable results for your production 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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect product performance.

Specification

Item	Specification
Appearance	Orange to reddish-brown powder
Identification (IR)	Conforms to structure
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.