Description

Pigment Yellow 188 is a high-performance, green-shade diarylide yellow pigment known for its excellent color strength and durability. This compound is valued for its superior lightfastness, heat stability, and solvent resistance, making it a reliable choice for demanding industrial applications. It is primarily used by manufacturers in the plastics, coatings, and printing ink industries seeking vibrant, consistent, and long-lasting yellow coloration.

Application

• Primary colorant for the coloration of plastics, including polyolefins (PP, PE), PVC, and engineering resins.
• Formulation of high-quality industrial and decorative coatings, such as automotive paints and powder coatings.
• Manufacturing of printing inks for packaging, publications, and specialty printing processes.
• Pigmentation of masterbatches and concentrates for uniform color dispersion in polymer processing.
• Coloring of synthetic fibers and spin-dyed materials.
• Use in specialty applications requiring high weather resistance and chemical inertness.

Basic Information

Product Name	Pigment Yellow 188
CAS No.	23792-68-9
Molecular Formula	C36H32Cl2N6O4
Molecular Weight	683.59 g/mol
Synonyms	Pigment Yellow 188; C.I. Pigment Yellow 188; Diarylamide Yellow HR; 3,3'-[(3,3'-Dichloro[1,1'-biphenyl]-4,4'-diyl)bis(azo)]bis[4-chloro-2-methylbenzamide]; 2-Methyl-5-chlorobenzamide, 3,3'-[(3,3'-dichloro[1,1'-biphenyl]-4,4'-diyl)bis(azo)]bis[4-chloro-; C.I. 21094; Yellow Pigment HR; Permanent Yellow HR
EINECS	Contact for details

Quality Control

Our Pigment Yellow 188 is manufactured under strict quality management systems to ensure batch-to-batch consistency and performance. Quality parameters including color strength, hue, 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, and well-ventilated area at room temperature (15-25°C). Keep away from incompatible materials and sources of ignition. Due to its light-sensitive nature, prolonged exposure to direct light should be avoided to maintain product integrity.

Specification

Item	Specification
Appearance	Yellow Powder
Identification (IR)	Conforms
Color Strength	100 ± 5% (vs. Standard)
Hue	Within agreed tolerance
Resistance to Light	7-8 (ISO 105-B02)
Heat Stability	≥ 280°C
Moisture Content	≤ 2.0%
Ash Content	≤ 1.0%
Particle Size (D50)	0.2 - 0.5 µm

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