40 of it ends up as ashes after incineration, and is difficult to dispose of
Sorting polymer wastes before incineration will become necessary in the future
Since the combustion of relatively pure polyolefins generates too much heat for traditional furnaces, newer high temperature furnaces with ceramic liners might be needed this will add significantly higher costs to the already very large cost for building incineration-to-energy plants
Gathering, sorting, and transportation are addition to the plant cost for incineration