deunydd meddal
Calsit, Dolomite, chaolin, Barite, Quartz, Talc, Zircon Sand, Wollastonite, Glo Powdwr, Calsiwm Light carbonad, Mica, bocsit, Attapulgite, brucite, bentonit, Garnet, Magnesite, Andalusite, Pyrophyllite, potasiwm ffelsbar, Diopside, Rectorite, diatomit , gypswm, Pearlite etc.
deunydd caled
Charborwndwm, Boron carbid, Gwyn Corundum, Zirconia, Ceriwm Ocsid, Tymheredd Uchel Alwmina'n, Silicon nitrid, Boron Nnitride, Brown Ymdoddedig Alwmina'n etc.
Dysgu mwy