Fiberglass ke thepa ea inorganic non-metallic e nang le thepa e ntle haholo.Lebitso la pele la Senyesemane: fiber ea khalase.Lisebelisoa ke silika, alumina, calcium oxide, boron oxide, magnesium oxide, sodium oxide, joalo-joalo E sebelisa libolo tsa khalase o...
Bala haholoanyane