Oil soluble dye is also called oil dye, oil-based dye or solvent based dyes. It has better temperature stability in engineering plastics, very high brightness and do result in completely transparent plastics without any haze and light scattering.

Processing is easy and process parameters like viscosity remain unaffected. Process conditions for engineering plastics like polystyrene, ABS, PC, PMMA, PA and others are quite severe. During extrusion and injection moulding of PC the dyes have to withstand temperatures up to over 350°C for some minutes. Only selected oil solvent dyes do show the needed chemical resistance. Chemical stability also leads to long lasting final products which have to withstand sunlight and weather. 

As an example red car taillights will last as long as the car itself without loosing the bright red colour. To achieve this, the right transparent polymers and right dyes have to be taken.