Description

C.I. Direct Orange 31 is a high-purity, water-soluble anionic dye belonging to the direct dye class, widely recognized for its vibrant orange hue and excellent substantivity to cellulosic fibers. This product is valued for its reliable color yield and good fastness properties, making it a critical component in industrial dyeing processes. It is primarily utilized by manufacturers in the textile, paper, and leather industries seeking consistent and cost-effective coloring solutions.

Application

• Primary dyeing of cotton, viscose, and other cellulosic fibers in the textile industry.
• Coloration of paper products, including specialty papers and packaging materials.
• Dyeing of leather and leather goods to achieve uniform orange shades.
• As a colorant for the production of inks and toners.
• Used in the biological staining sector for histological applications.
• Potential use as a tracer or marker in industrial and research applications.

Basic Information

Product Name	C.I. Direct Orange 31
CAS No.	6420-03-7
Molecular Formula	C32H20N6Na4O13S4
Molecular Weight	956.78 g/mol
Synonyms	Direct Orange 31; Direct Orange 31 (C.I.); C.I. 29150; Benzo Orange S; Sirius Orange S-GL; Chlorazol Orange AG; Direct Fast Orange AG; Direct Orange AG; Pontamine Orange AG; Pyrazol Orange; Diazol Orange 2G; Direct Orange 2GL; Direct Orange GL; Direct Orange S
EINECS	229-178-9

Quality Control

Our production of C.I. Direct Orange 31 adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance reliability. Every lot is tested against key parameters including color strength, shade, solubility, and impurity profile. Certificates of Analysis (COA) documenting these results are provided to guarantee the product meets your specific application requirements.

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 and sources of heat. The product is light-sensitive and should be stored away from direct light exposure to maintain stability.

Specification

Item	Specification
Appearance	Orange to reddish-brown powder
Identification (IR)	Conforms to standard
Color Strength	100 ± 3% (vs. Standard)
Shade	Conforms to standard
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 0.5%
Solubility in Water	Conforms
pH (1% Solution)	6.0 - 8.0

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