Cupellation Furnace ‑ CF

The CF cupellation furnaces are designed for the cupellation, or fire assay test, of precious metals, which is a standard test method used to determine their purity.

The furnaces meet the Hallmarking requirements specified by the Convention on the Control and Marking of Articles of Precious Metals (known also as “Precious Metals Convention”, “Hallmarking Convention” or “Vienna Convention”).

The test method produces hazardous vapours. When used within a suitable fume management system, the cupellation furnaces are designed to handle the vapours without exposing the operator to these hazards. The design of the cupellation furnace range ensures protection from the corrosive environment which would damage a conventional furnace.

Carbolite Gero also offers a range of smelting/melting furnaces.

Standard features

1200°C maximum operating temperature
Designed for testing using the cupellation method to ISO11426:1999 the standard test method used by the UK Assay Office, a reference quantitative assay method by the International Hallmark Convention
The airflow, controlled by an adjustable valve, is preheated before entering the work chamber
Silicon carbide elements mounted above and below the chamber provide even heating of cupels, have good resistance to thermal shock & offer extended working life at high temperatures
Silicon carbide lined roof and hearth protect the heating elements and resist the corrosive fumes emitted during the cupellation process
Fumes are extracted through an insulated exhaust duct, with a removable container to collect condensed lead
Up & away counterbalanced vertically opening door fitted with observation hole
Element over-temperature protection controller
Fitted with 7 day, 24 hour time-switch
Content may be subject to modifications or corrections

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