Bobine ppgl bụ eriri galvalume mkpuchi agba, nke bụ okwu mkpọ okwu maka igwe galvalume agbagoro agbagoro, ọ na-eji aluzinc dị ka mkpụrụ.Mgbe ọgwụgwọ elu (chemical degenreasing na kemịkalụ mgbanwe ọgwụgwọ), n'elu kpuchie na oyi akwa ma ọ bụ ọtụtụ n'ígwé nke mkpuchi, site na mmiri na ọgwụgwọ, wee ghọọ PPGI.
Ihe nkiri agba nke anyị nwere ike ime 10-30microns.Ihe nkiri agba dị elu, ogologo ndụ ọrụ nke agba.
Ihe eserese bụ PE, SMP, HDP, PVDF, ects.