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    Pigment Yellow 181 P.Y.181, a reddish yellow pigment, was introduced to the market a few years ago. Its main area of application is in plastics, especially in polyolefins. In these media, P.Y.181 is heat stable up to 300°C and very lightfast. 1/3 SD HDPE samples (1% TiO2), for instance, equal step 8 on the Blue Scale. The pigment does not affect the shrinkage of the partially crystalline polymer. P.Y.181 does not migrate in plasticized PVC. Besides, it shows excellent lightfastness in this medium. P.Y.181 is extremely heat stable, which makes it a suitable pigment for other polymers which are processed at high or very high temperature. The list includes PS, ABS, polyester, polyacetal, and various other technical plastics.