THROUGH THE GREENFOAM PROJECT, THE INNOVATIVE START-UP GPS TECH INTENDS TO DEVELOP A TECHNOLOGY BASED ON ADDITIVES FLAME RETARDANT FOR EPS (EXPANDED POLYSTYRENE) AND XPS (EXTRUDED POLYSTYRENE) COMPLETELY HALOGEN-FREE, BASED ON POLYMER ADDITIVES THAT ALSO HAVE THE ADVANTAGE OF NOT MIGRATING OVER TIME OUTSIDE THE MATERIAL, ALSO LIMITING THE DISPERSION IN THE ENVIRONMENT DURING THE LIFE OF THE ARTIFACTS, WITH IMPORTANT APPLICATIONS IN THE LIFE CYCLE OF THE EXPANDED PANELS USED IN THE CHAIN OF CONSTRUTIONS.