The purpose of this analysis is the development of an efficient sampling protocol for plastic waste streams. A model waste from different polymers was formulated, rich in ABS and containing PS, PP and PE in smaller proportions. Additionally, one bromine containing flame retardant is added to a final concentration of either 500ppm or 50ppm. Different sampling approaches were followed including extrusion and/or cryogenic grinding as a homogenization step. Each approach was assessed via various analytical techniques as to homogenization efficiency. This dataset contains raw MFR data of the model waste from the different sampling approaches. The content is: ·One Excel file containing MFR data of the model waste, wherein the approach was based on extrusion and measurement protocol ·One Excel file containing MFR data of the model waste, wherein the approach was based on cryogenic grinding and measurement protocol ·One Word file containing further information about the methodology and nomenclature This dataset was generated in the framework of PRecycling Horizon Europe project (101058670)