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Nk’ikigo gikora ibumba mu Bushinwa, ugereranyije n’ibumba ryo mu gihugu, ibiciro byo kohereza ibumba mu mahanga biri hejuru cyane mu myaka ishize, icyuho giterwa n’amahame ngenderwaho ya diffriend. Ishyirahamwe ry’Abanyamerika ry’Inganda za Plastic (SPIAN-102-78) rigabanya ibumba mu byiciro bitanu. Ubwo bwoko butanu bw’ibumba bufite ibisabwa bitandukanye, kandi amahame ngenderwaho yo gushyira mu byiciro akoreshwa gusa kugira ngo ahuze n’imashini itera ibumba ifite imbaraga ziri munsi ya toni 400.

Inshuro y'ubuzima yikuba inshuro miliyoni imwe, by'umwihariko ku bushobozi bwo gukora ibicuruzwa. Guhitamo icyuma cyiza cyo gukora, gihuye n'iki gikoresho cyo mu rwego rwo hejuru bisaba igiciro kinini. Ibisabwa bigaragazwa ku buryo bukurikira:

(1) Bikenewe kuba bifite amakuru arambuye ku gishushanyo mbonera cy'ibihumyo.
(2) Ibisabwa ku gukomera kw'ishingiro ry'ibimera byibuze BHN280 (HRC30).
(3) Ubuso bw'ibihumyo (harimo n'ibihumyo byo mu mutwe) nibura mu bwoko bwa BHN450 (48HRC), ibindi bikoresho byose nk'ibihumyo, ibihumyo, ibihumyo bigororotse, nibindi bigomba gukomera.
(4) Uburyo bwo gusohora bugomba kugira uburyo bwo kuyobora.
(5) Akamashini ko ku ruhande kagomba gushyirwaho icyapa cyo kwambara.
(6) Ibumba ry'ubushyuhe, ibumba ryo hagati, imashini iterera n'ibindi bice biri muri ibumba bigomba gushyirwaho hifashishijwe uburyo bwo kumenya ubushyuhe.
(7) Ku bijyanye n'igihe cyo gukoresha ifumbire, ubwiza bw'umusaruro buzagabanuka cyangwa igihe cyo gukoresha ifumbire cyongerewe bitewe n'uko imiyoboro y'amazi ikonje yangiritse umunsi ku wundi, bityo ibikoresho byo gushyiramo cyangwa ibikoresho byo gukoresha ifumbire byagiriwe inama yo kuvura ingese.
(8) Ibi bikoresho byose by’ubudozi bigomba gushyirwaho uburyo bwo gufunga imashini ku murongo wo gutandukanya.

IGICE CYA 2

Inshuro z'ubuzima ziyongeraho inshuro zigera ku 500.000 kugeza kuri 1,000,000. Kugira ngo hakorwe ibicuruzwa binini, ibyuma byiza bizakoreshwa mu gukora igiciro gihenze. Ibisabwa ni ibi bikurikira:

(1) bagomba kuba bafite amakuru arambuye ku gishushanyo mbonera cy'ibihumyo.
(2) Ibisabwa ku gukomera kw'ishingiro ry'ibimera byibuze BHN280 (HRC30).
(3) Ubukomere bw'ubuso bw'imbere n'ubwo hagati bigomba kuba biri hagati ya BHN540 (HRC 48), ibindi bikoresho byose bigomba gushyushwa.
(4) Shyiraho uburyo bwo kumenya ubushyuhe ku ibumba, ibumba ryo hagati, utumashini duto n'ahandi hantu hashoboka.
(5) Ibikoresho byose by'ubu bwoko bigomba gushyirwaho uburyo bwo gufunga ibikoresho hagati y'ubuso bw'umurongo utandukanya.
(6) Amahirwe y'ibicuruzwa bikurikira arakenewe cyangwa ntayo, bitewe n'ingano ya nyuma y'umusaruro. Ni byiza ko ibi bikoresho nabyo bikora ibiciro byemejwe.
Sisitemu yo kuyobora ejector, Slider wear plate, anti-sursion Colling manifold, Electroplating ku ibumba ryo mu mwobo (irwanya-corrosion).

IGICE CYA 3

Inshuro zigera ku nshuro 500.000. Ikoreshwa nk'umusaruro w'ibicuruzwa uri hagati, igiciro kirahagije. Ibisabwa ni ibi bikurikira:

(1) bagomba kuba bafite amakuru arambuye ku gishushanyo mbonera cy'ibihumyo.
(2) Ibisabwa ku gukomera kw'ishingiro ry'ibimera byibuze BHN165 (HRC17).
(3) ibimera byo mu mwobo n'ibiri mu gice cy'imbere bigomba kuba bifite ubukana bwa BHN280 (HRC30) cyangwa birenga.
(4) ibindi bikoresho byose bishobora gutorwa n'ababitanga.

IGICE CYA 4

Ingengabihe y'ubuzima yikuba inshuro zigera ku 100.000. Ku bushobozi buke bw'ibicuruzwa, ubushobozi bwo kwangirika kw'ibikoresho by'ibihumyo ntabwo buri hejuru, igiciro kiri hasi ugereranije n'urwego rusanzwe. Ibisabwa ni ibi bikurikira:

(1) Tanga igitekerezo cyo gutanga amakuru ajyanye n'imiterere y'ibihumyo.
(2) Ishingiro ry'ibumba rishobora kuba icyuma cyoroshye cyangwa icyuma cya aluminiyumu.
(3) Ifumbire yo mu mwobo ishobora kuba icyuma cya aluminiyumu, icyuma cyoroshye cyangwa ikindi kintu gishobora kumenyekana.
(4) Ibikoresho byose bishobora gutorwa n'ababicuruza ku buntu.

IGICE CYA 5

Inshuro z'urugendo ntizirenze inshuro 500. Ikoreshwa mu gutanga umubare muto w'icyitegererezo cya mbere, igiciro ni gito cyane. Ibisabwa ni ibi bikurikira:

Imiterere y'ibumba ishobora kuba ibikoresho bikozwe mu cyuma, epoxy resin, cyangwa ikindi gikoresho gitanga imbaraga zihagije zo gukora umubare muto w'ibice.