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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GLOBAL LAB STANDARD - Trusted by gold mines, hallmarking experts, and geological labs worldwide—join the elite refining community.
HIGH TEMP RESILIENCE - Engineered to endure intense cupellation furnace temperatures between 1650-1700°F without compromise.
LEAD ABSORPTION POWERHOUSE - Each cupel absorbs up to 69.2 grams of lead, ensuring flawless assay results every time.
PREMIUM DEAD BURNT MAGNESIA - Made from top-tier MgO for a hard, smooth surface that guarantees exceptional performance in precious metal refining.
PRECISION CRAFTED CONSISTENCY - Uniform 1-3/4" diameter and 1-7/16" height for reliable, repeatable refining and melting processes.

This lot of 8 high-quality cupels, crafted from dead burnt magnesia, offers precise dimensions and exceptional lead absorption (69.2g each). Designed to withstand furnace temperatures up to 1700°F, they deliver consistent, professional-grade results for gold assay, smelting, and refining applications worldwide.

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Color	White
Shape	Round
Material Type	Lead
Number of Pieces	8
Batteries Included?	No
Brand	Make Your Own Gold Bars
Manufacturer	Make Your Own Gold Bars
Item model number	16351
Product Dimensions	17.78 x 10.8 x 6.35 cm; 925 g
ASIN	B0749KL45F

Make Your Own Gold BarsLot of 8 - # 8AM Mabor Cupel 1-3/4" Gold-Assay-Smelting-Refining-Melting-Cupels

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