Ngwa igwe eji akwa akwa akwa akwa bụ igwe igwe agba agba nke na-eji galvanized steel ma ọ bụ aluzinc dị ka mkpụrụ.Mgbe elu tupu ọgwụgwọ (chemical degenreasing na kemịkalụ mgbanwe ọgwụgwọ), n'elu mkpuchi na a oyi akwa ma ọ bụ ọtụtụ n'ígwé nke mkpuchi, site na mmiri na-agwọ ọrịa, wee ghọọ okokụre ngwaahịa.
Mpempe akwụkwọ a kwadebere nke ọma nwere uru nke ịdị arọ nke ọkụ ọkụ, ike dị elu, ịrụ ọrụ seismic dị mma, ntinye ngwa ngwa, ọdịdị mara mma, wdg. Ọ bụ ezigbo ụlọ na akụrụngwa.A na-ejikarị ya eme ihe maka ihe owuwu envelopu, mbadamba ala, taịlị elu ụlọ, yana enwere ike iji ya rụọ ụlọ ndị ọzọ.