Description

Direct Orange 4 is a synthetic azo dye belonging to the class of direct dyes, valued for its ability to color cellulosic fibers like cotton and paper without the need for a mordant. This compound is essential for achieving consistent, vibrant orange hues with good wash fastness in industrial dyeing processes. It is primarily needed by manufacturers in the textile, paper, and leather industries for bulk coloration applications.

Application

• Textile Dyeing: Primary application for dyeing cotton, viscose, and other cellulosic fibers in exhaust and continuous dyeing processes.
• Paper Coloring: Used in the mass coloration of paper and paperboard to produce colored packaging, tissues, and specialty papers.
• Leather Finishing: Employed in the dyeing of leather goods, providing a range of orange shades for footwear, apparel, and upholstery.
• Ink Formulation: A colorant component in the manufacture of certain printing inks and toners.
• Biological Staining: Potential use as a histological stain in laboratory settings for microscopic analysis.
• Wood Staining: Applied for coloring wood and wood-based products to enhance aesthetic appeal.

Basic Information

Product Name	Direct Orange 4
CAS No.	3626-38-8
Molecular Formula	C₁₆H₁₀N₂Na₂O₇S₂
Molecular Weight	452.37 g/mol
Synonyms	Direct Orange 4; Direct Orange IV; C.I. Direct Orange 4; C.I. 22135; Direct Orange G; Direct Orange GG; Pontamine Orange GG; Benzo Orange GG; Chloramine Fast Orange GG; Diazol Orange GG; Sirius Orange GG
EINECS	222-842-6

Quality Control

Our Direct Orange 4 is manufactured under a stringent quality management system to ensure batch-to-batch consistency and performance. The product is tested against key parameters including color strength, shade, solubility, and impurity profile. A Certificate of Analysis (COA) detailing specifications such as purity (assay), moisture content, and heavy metal limits is provided with every shipment to guarantee it meets the requirements for industrial dyeing applications.

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. The product is light-sensitive (store away from light).

Specification

Item	Specification
Appearance	Orange to brown powder
Identification (IR)	Conforms to standard
Assay (HPLC)	Min. 85%
Color Strength	100 ± 3% (vs. Standard)
Shade	Conforms to standard
Moisture Content	Max. 5.0%
Water Solubility	Conforms
Ash Content	Max. 1.0%

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