Girazi rinoshandiswa kugadzira girazi fiber rakasiyana nerezvimwe zvigadzirwa zvegirazi. Girazi rinoshandiswa kune fiber dzakatengeswa munyika ine silica, alumina, calcium oxide, boron oxide, magnesium oxide, sodium oxide, nezvimwewo maererano nealkali yemukati mugirazi, iyo ...
Verenga zvimwe