He momo ngongo kore-tui te ngongo pōro. He rite tonu te tikanga hanga ki te paipa kore-tui, engari he whakaritenga pakari mō te momo maitai e whakamahia ana hei hanga paipa maitai. E ai ki te whakamahinga pāmahana, e rua ngā momo ngongo pōro whānui me te ngongo pōro pēhanga-teitei.

Ko te āhuatanga ā-pūkaha o te ngongo poiha he tohu nui hei whakarite i te pai o te mahi a te maitai. E whakawhirinaki ana ki te hanganga matū o te maitai me te pūnaha maimoatanga wera. I roto i te paerewa paipa maitai, e ai ki ngā whakaritenga whakamahinga rerekē, kua whakaritea ngā āhuatanga kume (kaha kume, kaha tuku, pūwāhi tuku rānei, roanga) me te pakeke, ngā tohu pakari, me ngā whakaritenga a te kaiwhakamahi mō te mahi pāmahana teitei me te iti.

① Ko te pāmahana whānui o ngā ngongo poihau kei raro iho i te 350℃, ko te nuinga o ngā paipa whare he mea hanga mai i te paipa rino waro Nama 10, Nama 20, paipa rino wera rānei, he paipa makariri rānei.

Ngongo kōhua

Ngongo kōhua

(2) He maha ngā wā ka whakamahia ngā ngongo poiha pēhanga teitei i raro i ngā āhuatanga pāmahana teitei me te pēhanga teitei. I raro i te mahi a te hau paipa pāmahana teitei me te mamaoa wai, ka puta te waikura me te waikura. Me whai kaha pakari te paipa maitai, me ātete ki te waikura me te pumau o te hanganga moroiti.