Maxay yihiin agabka foornada tuubada heerkulka sare tuubooyinka?

Qalabka foornada tuubada heerkulka sare waa: 314 birta kuleylka u adkeysata, galaaska quartz, ceramics corundum, tuubooyinka dhoobada alumina ee nadiifka ah iyo walxo kale. Guud ahaan, foornada tubbada 800-1200 digrii waxay isticmaashaa 314 tuubo bir ah ama tuubo dhalada quartz ah, iyo foornada 1400 digrii waxay isticmaashaa 99 tube dhoobada corundum.