I-Cupel luhlobo oluthile lwezixhobo ezirhabaxa ezirhangqekayo ezisetyenziselwa ukufunxa i-load oxide (okanye i-bismuth oxide) xa uthuthu luvuthela iqhosha lelothe (okanye i-bismuth buckle). Ngexesha lokuvuthuza kothuthu, ilothe ifakwa kwi-oxidized lead monoxide (PbO), uninzi lwayo lufunxwa sisitya sothuthu. Igolide, isilivere, iplatinam, kunye nezinye iintsimbi ezixabisekileyo zenza iaggregates kwi cupel, ethi ke isetyenziswe ukumisela umxholo wentsimbi exabisekileyo. I-Cupel idla ngokwenziwa nge-magnesium oxide, uthuthu, i-samente yasePortland kunye nezinye izinto. Kuvavanyo lwegolide kunye nesilivere, amaqondo obushushu aqhelekileyo aqhuma umlotha angama-900 ukuya kwi-1000 ° C, kodwa anokwahluka ngetekhnoloji, ukuhamba komoya, kunye nempahla yesitya sothuthu. I-Cupel yinyathelo lokugqibela kunye neyona nto ibalulekileyo kwinkqubo yokuvavanya igolide ngomlilo. Ngoko ke, umgangatho wesitya esimpunga ubaluleke kakhulu.
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