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Pigment Yellow 183 P.Y.183 is considered a specialty product for the coloration of plastics. This monoazo yellow calcium pigment lake affords reddish, somewhat dull yellow shades with poor tinctorial strength. 1/3 SD HDPE colorations (1% TiO2) require 0.32% pigment. In such media, the pigment is thermally stable up to 300°C. Polymer shrinkage is practically unaffected. The pigment provides very good lightfastness; 1/3 SD colorations equal step 7–8 on the Blue Scale. P.Y.183 is also recommended for other high temperature processed plastics. In ABS, for example, it is thermally stable up to 300°C. P.Y.183 is bleed resistant in plasticized PVC, where its poor tinctorial strength is of some disadvantage.