Index Number: Pigment Yellow 181
C.I. Structure Number: 21290
Chemical category: Benzimidazolones
Molecular formula: C₂₅ H₂₁N₇O₅
Relative molecular mass: 499.48
Ranbar yellow P3450 benzimidazolone yellow organic pigment, pigment yellow 181, this pigment is a special type of red light yellow benzimidazolone, with a hue angle of 66.5 degrees (1/3 SD, HDPE);
It is mainly used for coloring of plastics, especially polyolefins, without dimensional deformation, excellent thermal stability and light fastness, heat resistance up to 300°C, and light fastness of 7-8. It is widely used for coloring plastics, especially for resins processed under high temperature, such as PS, ABS, PE, etc.; it is also used for coloring viscose fibers and coatings.
