Cupellation furnaces HC, HCV-C and PR-C series

Muffle furnaces for cupellation and acid attack with SiC chamber and forced smoke extraction

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Laboratory-ovens-Hobersal

Muffle furnace from 1200ºC to 1300ºC for cupellation and work with acids thanks to the silicon carbide (SiC) protection chamber and its powerful forced extraction avoid creating an acid atmosphere during the process, avoiding damage to the interior of the furnace and the heating elements, extending service life

Standard equipment

  • Volumes from 3,7 to 500 liters
    maximum temperatures of 1200ºC and 1300ºC
  • Ramp programmer up to 64 steps
  • SiC Chamber
  • Forced smoke extractor chimney
  • Side and pantrograph side door
  • Ceramic tray
  • Double casing with air chamber to have low surface temperature
  • Solid state relays provide for low noise operation
  • Safety switch
  • Safety contactor
  • Heating pilot light
  • Thermocouples K (1000ºC-1200ºC) or S (1300-1400ºC)
  • Homogeneity +/-5ºC – Stability +/-1ºC
  • Furnace shutdown in case of thermocouple breakage
  • Chimney at the rear of the furnace
  • Furnace control at the bottom of the furnace or independent control box

Controllers

  • Eurotherm EPC 3016 programmer (10 programs – 25 segments) + itools logging software (allows curve downloads in Excel format) via Ethernet
  • Nanodac programmer according to AMS2750E and 21CFR11 standards

Accessories

  • Controlled cooling by fresh air turbine and exhaust flap
  • Inert gas for manual or automatic gas supply system
  • Ceramic or metal rack for loading ceramic or steel trays
  • Port for thermocouple
  • Observation windows
  • Over temperature alarms (OTP Over temperature protection)
  • Inox construction
  • Ceramic trays, refractory steel plates, steel collection pan
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Cupellation Furnaces: Precision and Reliability for Precious Metal Separation

At Hobersal, we provide cupellation furnaces engineered for accurate results, stable performance, and long-term durability—ideal for laboratories, refineries, and companies working with precious metals.

What is a Cupellation Furnace?

A cupellation furnace is a specialized thermal system used to separate precious metals—mainly gold and silver—from base metals within an alloy. This essential metallurgical process relies on a cupel, which absorbs impurities while the noble metals remain purified.

How the Process Works

  1. Preparation and Heating
    The sample is placed in a cupel and introduced into the furnace, which reaches controlled temperatures between 900 and 1100 °C.

  2. Oxidation of Base Metals
    Base metals oxidize quickly when exposed to high heat.

  3. Purification by Absorption
    The cupel absorbs these oxides, leaving behind a small metal bead composed almost entirely of gold or silver.

This method delivers consistent, precise, and highly reliable results, making it essential for laboratory analysis and quality control processes.

Advantages of Our Cupellation Furnaces

  • Precise temperature control for highly accurate outcomes

  • Excellent stability and safety at high temperatures

  • Robust construction designed for intensive use

  • Optimized energy consumption

  • User-friendly design for easy operation and maintenance

Applications

Our cupellation furnaces are widely used in:

  • Mineral and metallurgical testing laboratories

  • Precious metal refineries

  • Mining companies

  • Research centers

  • Foundries and quality-control departments