Description

Direct Yellow 12 is a synthetic anionic azo dye belonging to the class of direct dyes, known for its bright yellow hue and strong affinity for cellulosic fibers. Its primary value lies in providing excellent wash and light fastness properties on cotton, rayon, and paper without the need for a mordant. This dye is essential for manufacturers in the textile, paper, and leather industries seeking a reliable and cost-effective coloring solution for bulk applications.

Application

• Textile Dyeing: Primary application for dyeing cotton, viscose rayon, and other cellulosic fibers to achieve vibrant yellow shades.
• Paper Coloring: Used in the production of colored papers, tissues, and paperboard where a stable yellow color is required.
• Leather Finishing: Employed in the dyeing of leather goods, providing good penetration and color uniformity.
• Ink Formulation: A component in the manufacture of inks for various printing applications.
• Biological Staining: Potential use as a histological stain in laboratory settings.

Basic Information

Product Name	Direct Yellow 12
CAS No.	2870-32-8
Molecular Formula	C30H26N4Na2O8S2
Molecular Weight	680.66 g/mol
Synonyms	Direct Yellow R; C.I. Direct Yellow 12; Pontamine Yellow R; Sirius Yellow R; Chlorazol Yellow R; Direct Fast Yellow R; Amanil Yellow R; Atlantic Yellow R; Benzo Yellow R; Diazol Yellow R
EINECS	220-706-6

Quality Control

Our Direct Yellow 12 is manufactured under a strict quality management system to ensure batch-to-batch consistency and performance. Each lot is tested against key parameters including color strength, shade, solubility, and impurity profile to meet industry specifications. A Certificate of Analysis (COA) detailing purity, physical properties, and conformance is provided with every shipment to support your quality assurance protocols.

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.

Specification

Item	Specification
Appearance	Yellow to Brownish-Yellow Powder
Identification (IR)	Conforms to Standard
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
Shade	Within Agreed Limits
Solubility in Water	Conforms
Fastness Properties	To be specified per grade

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