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AI Overview
A 9 Fire Assay Cupel is a specialized, porous crucible, often made of magnesium oxide or bone ash, used to separate precious metals (gold/silver) from base metals (like lead) during fire assaying. These cupels absorb base metal oxides while retaining the molten, noble metal bead (prill) at high temperatures, typically 1650-1700°F.
Key Features and Applications:
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Web results
Magnesium Oxide, Fire Assay Cupel, Gold. Silver Refining
High Plains Prospectors
https://www.highplainsprospectors.com › products › 6a...
High Plains Prospectors
https://www.highplainsprospectors.com › products › 6a...
The cupels are designed to be used in mining equipment for fire assay testing. With these cupels, you can effectively remove impurities from precious metals and ...Read more
$2.90Out of stock
Cupels – Legend Inc. Sparks, Nevada USA
Legend Inc.
https://www.lmine.com › Assay Supplies
Legend Inc.
https://www.lmine.com › Assay Supplies
Cupels are magnesia or bone ash cup shaped containers used in assaying to separate precious metals from base elements such as lead.Read more
Web results
Fire Assay Crucibles And Cupels丨Gold Assaying Supplies
CS Ceramic Co.,Ltd
https://www.csceramic.com › gold-melting-ceramic-cruci...
CS Ceramic Co.,Ltd
https://www.csceramic.com › gold-melting-ceramic-cruci...
Fire assay crucibles & cupels offered by CSCERAMIC are specifically formulated to eliminate impurities,allowing you to extract the most pristine gold ...
Fire Assay Procedure
911Metallurgist
https://www.911metallurgist.com › Gold Extraction
911Metallurgist
https://www.911metallurgist.com › Gold Extraction
Nov 24, 2016 — The precious metals can be isolated by a carefully controlled oxidizing fusion, in a porous container called a cupel. Lastly, fire assay is ...Read more
Cupellation
Wikipedia
https://en.wikipedia.org › wiki › Cupellation
Wikipedia
https://en.wikipedia.org › wiki › Cupellation
By then, fire assays were used for assaying minerals: testing fresh metals such as lead and recycled metals to determine their purity for jewellery and coin ...Read more
Salient Features - Perfect Assay Cupels Works
magnesiafireassaycupels.com
https://www.magnesiafireassaycupels.com › Magnesia_C...
magnesiafireassaycupels.com
https://www.magnesiafireassaycupels.com › Magnesia_C...
Perfect Assay Cupels are made from unique blend of DBM and fluxing agent · All Cupels absorbs approx 70% of their weight in grams · Does not react to atmospheric ...Read more
What Is a Cupel (Fire Assay)? Uses, Process & Choosing ...
Mechelec
https://mechelec.co › cupels-in-fire-assay-what-it-is-ho...
Mechelec
https://mechelec.co › cupels-in-fire-assay-what-it-is-ho...
Jul 25, 2025 — A cupel is a small, porous ceramic container crafted primarily from bone ash or magnesium oxide. Refiners use it during the cupellation ...Read more
Basic Info
FIRE ASSAY CONSUMABLES
https://fireassay.eu › basic-info
FIRE ASSAY CONSUMABLES
https://fireassay.eu › basic-info
The · Cupels should not crack when heated in the muffle and should be so strong that they will not break when handled with the tongs. · A good cupel should be ...Read more
fire assay crucible&assay cupel Supplier | XTL
Xtlceramic
https://www.xtlceramic.com › PRODUCTS
Xtlceramic
https://www.xtlceramic.com › PRODUCTS
Fire Assay Crucible size: 5g/20g//30g/40g/45g/50g/55g/65g/75g and No.8/No.8.5/9/No.9G/No.9.5 crucibles are avaivalbe and also we make the customzied size.Read more