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Alumina giraanta dhoobada
Qaybaha dhoobada ee heerkulka qolka waa insulator, sababtoo ah iska caabin sare sidaas darteed waxaa loo isticmaali karaa qalabka wax lagu dhejiyo, oo leh barta dhalaalaysa sare, sifooyinka heerkulbeegga sare, waxay ka samaysan yihiin qalabka birta ee heerkulka sare ee fudud ee oksaydhka, daxalka fudud ee daciifnimada.Iyo sababta oo ah alaabta alaabtu ma laha magnet, ma nuugo boodhka, dusha sare ma fududa inuu dhaco.
