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Bone ash Cement Magnesia-cs ceramic co.,ltd
Bone ash: Made from calcined sheep bones. Its low thermal conductivity allows lower furnace cupellation temperatures. The oxidation of lead generates heat. Temperature, at the lead surface, increases over the general furnace temperature.
Cement: Raw material is very cheap. When cement looses water of combination physical imperfections are produced & they can trap the doré.
Magnesia: Give more accurate silver assay values. More tolerant of the effects of cupelling dirty buttons. The type more commonly used in F.A. labs
- See more at: http://www.csceramic.com/csceramic/product/list.asp?c=cuples&subc=all#sthash.3k2ltnEv.dpuf |
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