DS EN 13900-4:2004 Pigments And Extenders - Methods Of Dispersion And Assessment Of Dispersibility In Plastics - Part 4: Determination Of Colouristic Properties And Ease Of Dispersion Of White Pigments In Polyethylene By Two-Roll Milling Defines a method of determining the colouristic properties of a test pigment in polyethylene (PE) relative to a standard, and ease the dispersion DPpe of pigments from the differences in tinting stren