Udonga lwekhethini yeglasi olunefreyimu yesinyithi ejikeleze iphaneli yeglasi lubizwa ngokuba ludonga lwekhethini yefreyimu. Lwahlulwe lwaba: udonga lwekhethini yefreyimu eveziweyo, udonga lwekhethini yefreyimu efihliweyo, kunye nodonga lwekhethini yefreyimu efihliweyo ngokwemo yodonga lwekhethini.
Udonga lwekhethini yeglasi yesakhelo luguquguquka, lulula, kulula ukuyifaka, kulula ukuyilungisa nokuyiqhaqha, kwaye kulula ukuyitshintsha nokuyilungisa.
Isakhelo esithe nkqo (okanye umqadi othe tye) sodonga lwekhethini lesakhelo siqala sifakwe kwisakhiwo esiphambili, size emva koko sifakwe umqadi othe tye (okanye isakhelo esithe nkqo). Isakhelo esithe nkqo kunye nomqadi othe tye zenze isakhelo. Izinto zephaneli zicutshungulwa zibe ziinxalenye zeyunithi efektri kwaye emva koko ziqiniswe kwisakhelo esenziwe ngesakhelo esithe nkqo kunye nomqadi othe tye. Umthwalo othwalwa yinxalenye yeyunithi yezinto zephaneli kufuneka udluliselwe kwisakhiwo esiphambili ngesakhelo esithe nkqo (okanye umqadi othe tye). Uhlobo oluqhelekileyo lolu lwakhiwo kukuba: emva kokuba isakhelo esithe nkqo kunye nomqadi othe tye zifakwe kwindawo ukuze zenze isakhelo, inxalenye yeyunithi yezinto zephaneli iqiniswe kwisakhelo. Icandelo leyunithi yezinto zephaneli liqhagamshelwe ngokuthe nkqo kwikholam kwaye liqhagamshelwe ngokuthe nkqo kumqadi othe tye, kwaye ijoyinti iphathwa nge-sealant ukuthintela ukungena kwamanzi emvula kunye nokungena komoya.
1. Isakhelo esiveziweyo: uhlobo lwe-inlay groove oludibeneyo, uhlobo lwe-inlay groove oludibeneyo, uhlobo lwe-inlay oluxutyiweyo;
2. Isakhelo esifihliweyo: uhlobo lwebhloko, uhlobo oluxhonyiweyo olupheleleyo, uhlobo oluxhonyiweyo oluncinci;
3. Isakhelo esifihlwe kancinci: sibonakala ngokuthe nkqo kwaye sifihliwe ngokuthe tye, sifihliwe ngokuthe nkqo kwaye sibonakala ngokuthe tye.
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