Iriburiro rya I Ubwoko bwibyuma bya plaque plaque:
Nandika icyuma ni ubwoko bwibicuruzwa byibyuma bifite ibyuma bisobekeranye ukurikije umwanya runaka hamwe numurongo wambukiranya (ibyuma bigoretse ibyuma, ibyuma bya kare, ibyuma bizunguruka, ibyuma biringaniye, nibindi), hanyuma bigasudira mumurongo wa kare hagati.Nandika icyuma gikoreshwa cyane cyane mugukora icyapa gipfundikira umwobo, icyuma cyubatswe cyuma, icyuma cyurwego rwicyuma, nibindi.Isahani yicyuma muri rusange ikozwe mubyuma bya karubone, ubushyuhe bwa dip galvanised, birashobora kugira uruhare mukurinda okiside.Irashobora kandi kuba ikozwe mubyuma.Nandika isahani yicyuma hamwe no guhumeka, gucana, gukwirakwiza ubushyuhe, kurwanya - kunyerera, imikorere idaturika.Nanditse ibipimo byerekana ibyuma: Ubushinwa YB4001-1991, YB / T4001-1998, YB / T4001.1-2007 (Ubushinwa muri 2007 verisiyo yanyuma yicyuma cya plaque);Byongeye kandi, Amerika, Ubwongereza, Ositaraliya na Nouvelle-Zélande nabyo bifite amahame yabyo, birashobora kandi gukurikiza abongereza BS4592-1-1995 hamwe n’Amerika ANSI / NAAMM (MBG531-88) n’ibindi bicuruzwa bitanga umusaruro.