The two primary considerations in selecting a crucible are chemical and thermal compatibility. Radak furnaces ship standard with an Alumina crucible because of its wide chemical and thermal compatibility. However, some materials present specific challenges that are overcome by using a crucible liner. Other challenges cannot be overcome using a liner alone. For these applications we have developed material-specific crucibles. Please see our Crucible Recommendations Guide for more information.

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Some applications may require the use of an insert placed inside the standard crucible. Such applications include evaporating materials that would react with the standard crucible material, and evaporating melting materials that have a higher coefficient of thermal expansion than the crucible material. In these cases, a tough metal insert placed inside the standard crucible to form a crucible liner. Crucible liners contain the molten or reactive material within the standard crucible, protecting the furnace.