Description

Pigment Yellow 181 is a high-performance, green-shade diarylide yellow pigment known for its excellent color strength and durability. This organic pigment is valued for its superior lightfastness, heat stability, and resistance to solvents, making it a reliable choice for demanding coloration applications. It is primarily utilized by manufacturers in the plastics, coatings, and printing ink industries seeking vibrant, consistent, and long-lasting yellow hues.

Application

• Coloration of engineering plastics and thermoplastic resins (e.g., PVC, PP, PE, ABS).
• Industrial and automotive coatings requiring high weather resistance.
• Printing inks, including packaging and publication gravure/flexographic inks.
• Masterbatch production for consistent color dispersion in polymer systems.
• Coloring of synthetic fibers and spin-dyeing applications.
• Specialty applications in artists' colors and decorative paints.

Basic Information

Product Name	Pigment Yellow 181
CAS No.	74441-05-7
Molecular Formula	C₃₆H₃₂Cl₂N₆O₄
Molecular Weight	675.59 g/mol
Synonyms	Pigment Yellow 181; C.I. Pigment Yellow 181; 1,1'-[(3,3'-Dichloro[1,1'-biphenyl]-4,4'-diyl)bis(azo)]bis[N-(2,4-dimethylphenyl)-3-oxobutyramide]; 1,1'-[(3,3'-Dichloro[1,1'-biphenyl]-4,4'-diyl)di(E)-diazene-2,1-diyl]bis[4-methyl-N-(4-methyl-2-nitrophenyl)-3-oxobutanamide]; P.Y. 181; Diarylide Yellow HR; Benzidine Yellow HR
EINECS	277-923-8

Quality Control

Our production of Pigment Yellow 181 adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance reliability. Each lot is tested against key parameters including color strength, shade, particle size distribution, and rheological properties. Certificates of Analysis (COA) documenting these specifications are provided with every shipment to support your quality assurance 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). Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	Yellow Powder
Color Strength	95 - 105% (vs. Standard)
Shade	Conforms to Standard
Particle Size (D50)	< 1.0 μm
Volatile Matter (105°C)	≤ 2.0 %
pH Value (10% Aqueous Slurry)	6.0 - 8.0
Oil Absorption	40 - 60 g/100g
Heat Stability (Plastic)	> 280°C
Lightfastness (1/3 SD)	7-8 (Blue Scale)

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