Description

Oil Yellow Ob CAS NO 131-79-3 is a synthetic organic pigment belonging to the diarylide yellow class, valued for its bright, greenish-yellow hue and strong tinting strength. This high-performance colorant is essential for achieving consistent and durable coloration in demanding industrial applications. It is primarily used by manufacturers in the plastics, coatings, and printing ink industries who require stable, lightfast, and heat-resistant yellow pigments for their products.

Application

• Plastics Coloring: Masterbatch and compound production for polyethylene (PE), polypropylene (PP), polystyrene (PS), and ABS, providing excellent dispersion and heat stability.
• Industrial Coatings: Formulation of high-performance paints, including automotive refinish, industrial maintenance, and coil coatings, where weather resistance is critical.
• Printing Inks: Used in solvent-based, water-based, and UV-curable inks for packaging, publication gravure, and flexographic printing.
• Synthetic Fibers: Mass coloration (dope dyeing) of polyamide and polyester fibers to produce colorfast textiles.
• Rubber Products: Coloring of technical rubber goods, footwear, and other elastomeric materials.
• Artists' Colors: A component in the manufacture of professional-grade oil and acrylic paints.

Basic Information

Product Name	Oil Yellow Ob
CAS No.	131-79-3
Molecular Formula	C32H26Cl2N6O4
Molecular Weight	629.49 g/mol
Synonyms	Pigment Yellow 12; C.I. 21090; Diarylamide Yellow AAA; Benzidine Yellow G; Permanent Yellow G; Vulcan Fast Yellow G; Lithol Fast Yellow 0991K; Diarylide Yellow AAA
EINECS	205-036-6

Quality Control

Our Oil Yellow Ob is manufactured under a strict quality management system to ensure batch-to-batch consistency and performance. Quality parameters including color strength, shade, particle size distribution, and chemical purity are rigorously tested against established specifications. A Certificate of Analysis (COA) detailing these results is provided with every shipment to guarantee compliance with your technical requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from heat sources and incompatible materials. Under these conditions, the product has excellent shelf stability.

Specification

Item	Specification
Appearance	Yellow Powder
Identification (IR)	Conforms to Standard
Color Strength	100 ± 5% (vs. Standard)
Hue	Within agreed tolerance
Purity (HPLC)	≥ 97.0%
Volatile Matter (105°C)	≤ 2.0%
Ash Content	≤ 1.0%
Particle Size (D50)	≤ 1.0 μm
Oil Absorption	40 - 60 g/100g
pH Value (10% Slurry)	6.0 - 8.0

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