Will the cupel absorb aluminum?

I don't know about aluminum. However cuppeling will remove the lead or bismuth carrier, as well as base metals such as copper present through oxidation, leaving the precious metal button behind. The button left behind should be .99 fine.

How many oz of silver can it hold at once

These cupels are for fire assaying. Probably 1-2 grams max. If you use them to melt only, may get 1toz in it(not very deep).

Can you use this in a propane furnace like a devil forge?

I’m not sure. These cupels are for assaying. If you are melting I would suggest clay graphite or silicon carbide crucible.

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Lot of 8 - # 8AM Mabor Cupel 1-3/4" Gold-Assay-Smelting-Refining-Melting-Cupels

Lot of 8 - # 8AM Mabor Cupel 1-3/4" Gold-Assay-Smelting-Refining-Melting-Cupels

Product ID: 380108820

Details

Brand
Make Your Own
Colour
White
Material
Lead
Item weight
0.93 Kilograms
Shape
Round

🔥Withstands 1650-1700°F assay furnace temps

🔬Precision 1-3/4" x 1-7/16" size consistency

⚖️69.2g lead absorption per cupel

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Description

🔥 Elevate Your Assay Game with Precision & Power ⚖️

CONSISTENT PRECISION - Uniform 1-3/4" diameter and 1-7/16" height for reliable, repeatable assay results every time.
HIGH TEMP DURABILITY - Engineered to endure intense assay furnace temperatures between 1650-1700°F without compromising integrity.
MAX LEAD ABSORPTION POWER - Each cupel absorbs up to 69.2 grams of lead, ensuring efficient precious metal separation.
VERSATILE PROFESSIONAL USE - Ideal for gold mines, precious metal refiners, hallmarking, geological labs, and test facilities worldwide.
PREMIUM MAGNESIA COMPOSITION - Crafted from dead burnt magnesia (MgO) for a hard, smooth surface that guarantees superior refining performance.

This lot of 8 high-quality cupels, made from dead burnt magnesia, offers consistent size and weight for precise precious metal assay and refining. Each cupel efficiently absorbs 69.2 grams of lead and withstands furnace temperatures up to 1700°F, making them essential tools for professionals in gold mining, refining, hallmarking, and geological testing.

Specifications

ASIN	B0749KL45F
Brand	Make Your Own Gold Bars
Brand Name	Make Your Own Gold Bars
Color	White
Colour	White
Item Weight	0.93 Kilograms
Item weight	0.93 Kilograms
Manufacturer	Make Your Own Gold Bars
Manufacturer Part Number	16351
Material	Lead
Material Type	Lead
Model Number	16351
Number of Items	8
Number of Pieces	8
Recommended Use	Precious metal assaying and refining, hallmarking, geological testing
Shape	Round
Size	1-3/4" x 1-7/16"
UPC	613825987533
Unit Count	8.0 Count

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89651CFA

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In stock

Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Desertcart purchases this item on your behalf and handles shipping, customs, and support to Senegal.

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