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    AI Overview
    Mabor Magnesia Cupels size PC - 254mm - immediate supply ...
    PC (Production Size) Fire Assay Cupels, often branded as Mabor Magnesia Cupels , are large, high-capacity, porous, and refractory containers used in professional fire assaying to separate precious metals (gold/silver) from base metals. The "PC" size generally refers to a large, production-oriented format, often measuring around
    254
    mm
     (10 inches), manufactured to handle large quantities of litharge (
    PbOcap P b cap O
    𝑃𝑏𝑂
    ) in industrial smelting and refining applications. 
    Key Features and Benefits 
    • Material: Made of high-quality dead-burnt magnesia (
      MgOcap M g cap O
      𝑀𝑔𝑂
      ), which provides excellent refractoriness and resists corrosion from alkaline lead oxide, preventing the pitting often found with bone ash cupels.
    • High Absorption Capacity: PC-sized Mabor cupels can absorb large quantities of lead oxide (litharge) produced during the oxidation of lead buttons.
    • Reduced Freezing: They offer a lower tendency for the lead to freeze at the end of the process compared to other materials, allowing for higher, more consistent recovery rates (97%–98.5%).
    • Physical Strength: These cupels are known for high mechanical strength and are not significantly affected by atmospheric changes, reducing breakage during transportation.
    • Surface Quality: The inner surface is perfectly smooth, which allows for easy removal of the precious metal prill (button). 
    Usage in Fire Assay 
    • Operation: Used during the cupellation step , the cupel is placed in a furnace at
      1650
      --
      1700∘𝐹
       (
      898
      --
      926∘𝐶
      ) where lead oxidizes and is absorbed into the pores, leaving behind a pure precious metal prill.
    • Preheating: Before use, the cupels are typically preheated in the furnace at
      850
      --
      900∘𝐶
       for 10 minutes to remove moisture and volatile compounds.
    • Applications: Essential for gold mining laboratories, precious metal refiners, hallmarking offices, and geological laboratories. 
    Alternatives and Sizes 
    • Other standard Mabor cupel sizes range from small (e.g., #2X, 7/8″) to large industrial types (e.g., #15, 6″).
    • Bone ash cupels are an alternative to magnesia, but offer different absorption rates and are generally more brittle. 
    Reputable suppliers often include Legend Inc. , Fireassay.eu, and CSCeramic . 
    • Mabor Magnesia Cupels size PC - 254mm - immediate supply
      Mabor Magnesia Cupels size PC – 254mm – immediate supply. ... Mabor Magnesia cupels size PC (production cupel) are perfectly smoot...
      FIRE ASSAY CONSUMABLES
    • Mabor Magnesia Cupel Block 21HB - immediate supply - Fire Assay
      Mabor Magnesia Cupel Block 21HB – immediate supply * ROBUST MECHANICAL STRENGTH. * NOT AFFECTED BY ATMOSPHERIC CHANGES. * NO SPITT...
      FIRE ASSAY CONSUMABLES
    • Magnesia Cupels & Magnesia Bullion Blocks - Fire Assay
      When using MABOR magnesia cupels, the assay have a reduced tendency to freeze. No cracking or spiting, and the beads do not attach...
      FIRE ASSAY CONSUMABLES
    Show all
    • Mabor Magnesia Cupels size PC - 254mm - immediate supply
      Mabor Magnesia Cupels size PC – 254mm – immediate supply. ... Mabor Magnesia cupels size PC (production cupel) are perfectly smoot...
      FIRE ASSAY CONSUMABLES
    • Mabor Magnesia Cupel Block 21HB - immediate supply - Fire Assay
      Mabor Magnesia Cupel Block 21HB – immediate supply * ROBUST MECHANICAL STRENGTH. * NOT AFFECTED BY ATMOSPHERIC CHANGES. * NO SPITT...
      FIRE ASSAY CONSUMABLES
    • Magnesia Cupels & Magnesia Bullion Blocks - Fire Assay
      When using MABOR magnesia cupels, the assay have a reduced tendency to freeze. No cracking or spiting, and the beads do not attach...
      FIRE ASSAY CONSUMABLES
    • Fire Assay Cupel - CS Ceramic
      Search * 6A 7A 8A Magnesia/ MgO Cupels. Magnesia cupel for smelting and assaying, High temperature resistance MgO cupel. Factory m...
      CS Ceramic Co.,Ltd
    • Mabor Magnesia Cupels – Legend Inc. Sparks, Nevada USA
      Mabor Magnesia Cupels * #2X Mabor Cupel 7/8″ – Case 1296. 16705. $107.17. ... * #3 Mabor Cupel 1″ – Case 1080. 16715. $107.17. ...
      Legend Inc.
    • Basic Info - Fire Assay
      FEATHERS * Feathers are sublimed crystals of solid litharge that deposit on the rim of the cupel, which is invariably cooler than ...
      FIRE ASSAY CONSUMABLES
    • XTL sintyron Fire Assay Magnesia Cupels 7a Cupel for Melting Gold ...
      Jan 9, 2023 — Table_title: XTL sintyron Fire Assay Magnesia Cupels 7a Cupel for Melting Gold cupel Table_content: header: | Place of Origin: | H...
      Xtlceramic
    • Cupels – Legend Inc. Sparks, Nevada USA
      Cupels are magnesia or bone ash containers used in assaying to separate precious metals from base elements. They are porous to met...
      Legend Inc.
    • Lot of 8 - # 8AM Mabor Cupel 1-3/4" Gold-Assay-Smelting-Refining- ...
      Product details * About this product. See more. * Top highlights. Brand. Make Your Own Gold Bars. Size. 1-3/4" x 1-7/16" Color. Wh...
      Amazon.com
    • Fire Assaying Magnesia Cupels Crucibles
      Fire Assaying Magnesia Cupels Crucibles * The products are widely used in mineral and mining industries for gold smelting and assa...
      Liling Zen Ceramic Co., Ltd
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    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 ...

    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

    Magnesia Cupels & Magnesia Bullion Blocks


    FIRE ASSAY CONSUMABLES
    https://fireassay.eu › magnesia-cupels-blocks
    FIRE ASSAY CONSUMABLES
    https://fireassay.eu › magnesia-cupels-blocks
    When using MABOR magnesia cupels, the assay have a reduced tendency to freeze. No cracking or spiting, and the beads do not attach to the fire assay cupel ...Read more

    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
    $2.90$4 · Out of stock
    Missing: PC ‎| Show results with: PC

    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

    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
    Missing: PC ‎| Show results with: PC

    Lot of 12 - # 8AM Mabor Cupel 1-3/4" Gold-Assay-Smelting ...


    Amazon.com
    https://www.amazon.com › Lot-12-Mabor-Cupel-Gold-...
    Amazon.com
    https://www.amazon.com › Lot-12-Mabor-Cupel-Gold-...
    CUPEL DIMENSION is 1-3/4" across the top & 1-7/16" tallThe lead button for cupellation is typically generated in the crucible fusion from the fire assay ...Read more

    Fire assay a pulverized cupel


    Gold Refining & Metal Extraction Forum
    https://goldrefiningforum.com › threads › fire-assay-a-...
    Gold Refining & Metal Extraction Forum
    https://goldrefiningforum.com › threads › fire-assay-a-...
    Aug 20, 2020 — I tried pulverizing the cupel to 100 mesh, and mixing it with 90g of legends fire assay flux with flour. I let it sit in the furnace at 2000f ...Read more
    Missing: PC ‎| Show results with: PC

    FAC6A Fire Assay Cupel Size 6A


    Almath
    https://almathcrucibles.com › product
    Almath
    https://almathcrucibles.com › product
    Made in Magnesia for fire assaying. This cupel has a tapered exterior, thick base and a hemispherical interior. Pack Sizes. Choose an option, 50 Pcs ...Read more
    £54.00 to £648.00 · In stock · $57 delivery

    Fire Assaying - Nevada Bureau of Mines and Geology


    Nevada Bureau of Mines and Geology
    https://nbmg.unr.edu › scienceeducation › Chemistry-Fire
    Nevada Bureau of Mines and Geology
    https://nbmg.unr.edu › scienceeducation › Chemistry-Fire
    The lead button that contains the gold and silver is then melted under oxidizing conditions in a bone ash cupel, a special crucible made of ashes of bone that ...Read more
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