PPGI bụ efere ígwè a kpụchara akpụcha (galvanized, aluminized zinc, nickel-plated, wdg.) ọgwụgwọ kemịkalụ elu (dereasing, phosphating, chromic acid passivation), emesịa tee ya agba, wee tee ya ihe ndị e ji esi nri.

Uru: o nwere ike ígwè nke ígwè ma dịkwa mfe ịkpụzi, ihe ndị e ji ihe ndị dị ndụ nwere ezigbo mma na iguzogide nchara. Mkpuchi ahụ nwere nrapado siri ike ma nwee ike idobe agba ọhụrụ ruo ogologo oge.

Ngwa: A na-ejikarị ya eme ihe n'ọtụtụ ebe na ihe owuwu, ngwa ụlọngwá ụlọ, ihe ndị mmadụ na-eji eme njem na mpaghara ndị ọzọ.