火试金镁砂灰皿​FIRE ASSAY CUPELS

FIRE ASSAY CUPELS/Magnesia ash dish 火试金镁砂灰皿

FIRE ASSAY CUPELS

Sigma’s are used to heat and separate gold and other precious metals from base metals in the fire assay process. Manufactured to exacting standards under ISO Guide 9001, the cupels can be produced in a range of custom sizes and to suit your specific testing and purity needs. Our magnesia cupels are made from world-class raw materials and can withstand extreme temperature shocks, offer reliable levels of lead absorption and produce consistent results with low losses. Sigma offers a wide variety of sizes of fire assay cupels to fit your mineral laboratory’s needs. Our cupels are packaged securely in a nested fashion to allow for efficient use of space in shipping and storage. See why Sigma is fast becoming a trusted global name in the mining and geochemical lab market.

Manufactured to exacting standards under ISO Guide 9001
World-class raw materials
Consistent results and low losses
Custom sizes available
Available Magnesite Products
Magnesite Cupels
Bullion Blocks
Furnace Powder
Available Cupel Sizes
All standard sizes are available:

List of Fire Assay Cupel sizes available to order.

Custom sizes available on request.

What are Fire Assay Cupels?

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Cupels are vessels made out of magnesite, bone ash or other materials which are used in the fire assay process to isolate the precious metals. Their porous nature allows them to be used to absorb base metals and impurities through a process of oxidisation. The precious metals being tested, due to their chemical nature, do not oxidise and remain on top of the cupel surface in a metallic bead known as a prill. Cupels are a critical part of the fire assay process, allowing metallurgists to reliably separate and measure the amounts of precious metals present in mineral samples. Not all magnesite is appropriate to produce cupels, so talk to Sigma and be sure to get the right product, first time.