What crucible is used to melt solid caustic soda?Why not quartz crucibles?
Do not use ceramic crucibles or quartz crucibles. Use metal crucibles, preferably with silver cruciblesThe quartz crucible reacts to form the sodium silicate (2NaOH+SiO2=Na2SiO3+H2O) ceramic crucible
Iron. React with ceramic or glass silica ash
A metal crucible can not be used with a porcelain crucible, because the reaction of caustic soda and silicate can not be used in ceramics