For more information on this item including purchasing options, please contact Skyline Lab Products LLC, by phone (520) 622-4836 or by email at email@example.com.
Cupellation is the last and most important step in fire assay process and as such, the quality of cupel is extremely crucial.
During cupellation, the lead is oxidized to litharge (PbO), most of which is absorbed by the cupel. Gold, silver, platinum and other precious metals form a bead in the cupel. The bead is subsequently treated to determine its precious metal content .
Cupels are typically made from magnesia MgO (sometimes mistakenly referred to as magnesite), bone ash, Portland cement and other materials.
Typical cupellation furnace temperatures in gold and silver assays are 900-1000°C, but can vary with technique, air flow volume and cupel material.
Our supplier aims to manufacture cupels with the following:
Robust mechanical strength.
Not affected by atmospheric changes.
No spitting of lead.
Rapid absorption of large quantity of litharge.
Free from cracking and pitting.
Beads are easily removable.
Perfect uniformity of quality.
Reduced tendency to freeze.
Consistently low losses.
Regularly tested in our own assay lab. Manufactured with unique blend of Magnesium Oxide and special fluxing ingredients.
Available sizes are: 6A, 7A, 7AS, 7AL, 8A and 9.
Customized sizes and services are also available.