Enwere ọtụtụ ụdịigwe anaghị agba nchara ọkpọkọ, na ojiji dị iche iche, dị iche iche teknuzu chọrọ, na dị iche iche mmepụta ụzọ. The elu dayameta nke ígwè ọkpọkọ ugbu a na-emepụta bụ 0.1-4500mm, na mgbidi ọkpụrụkpụ bụ 0.01-250mm.
Igwe anaghị agba nchara ọkpọkọ bụ oghere elongated gburugburu ígwè ihe onwunwe, nke a na-eji na mmanụ ala, chemical, ọgwụ, nri, ìhè ụlọ ọrụ, n'ibu instrumentation na ndị ọzọ ulo oru pipelines na n'ibu structural components. Ke adianade do, mgbe ekwe na torsional ike bụ otu, arọ bụ Mkpa ọkụ, n'ihi ya, ọ na-eji ọtụtụ ebe na-emepụta nke n'ibu akụkụ na engineering owuwu. A na-ejikarị ya eme ihe dị ka arịa ụlọ na arịa kichin.
Njirimara ọkpọkọ igwe anaghị agba nchara: nguzogide elu na-erughị 1000M; eyi ihe nchebe; nwere ike ịgbatị; ezigbo nguzogide kemịkalụ; ezigbo alkali metal na acid iguzogide; ike siri ike; ire ere.