PPGI ndi chidule cha chitsulo chopaka utoto chopangidwa kale, chimagwiritsa ntchito malata ngati gawo lapansi.Pambuyo pokonzekera pamwamba (kuchotsa mankhwala ndi mankhwala otembenuza mankhwala), pamwamba pake yokutidwa ndi wosanjikiza kapena zigawo zingapo za zokutira, kupyolera mu kuphika ndi kuchiritsa, ndiye kukhala PPGI.
The utoto filimu kuti tikhoza kuchita 10-30microns.Kukwera kwa filimu ya utoto, kumakhala moyo wautali wautumiki wa mtunduwo.
Zojambulajambula ndi PE, SMP, HDP, PVDF, ects.