Igbe nju oyi EPP, nke nwere echiche yiri nke ahụ dị ka igbe mkpuchi EPS anyị gara aga, ma emebere ya nke otu ụdị ụfụfụ ọhụrụ nke nwere arụmọrụ ka mma, ike dị mma na-enweghị ihe ụfụfụ na-efe efe ebe a ka EPS mere.Kedu ihe ọzọ, ha bụ ọkwa nri yana ezigbo enyi na gburugburu ebe obibi.