The first number in the product name of Nabertherm furnaces usually indicates the volume in liters. Standard muffle furnace sizes range from one liter to 60 liters. You can find the exact internal and external dimensions under the "Technical Data" tab on the product pages of the Nabertherm website.

The second number in the product name of Nabertherm furnaces usually indicates the maximum temperature. Standard muffle furnaces reach a maximum temperature of 1100 °C or 1200 °C. 

For a longer service life of the heating elements and insulation, the continuous operating temperature should be approximately 100 °C below the maximum temperature. For higher temperatures, Nabertherm offers brick-insulated muffle furnaces in several standard sizes up to 1300 °C, as well as a fiber-insulated version up to 1400 °C. 

Nabertherm muffle furnaces up to 1200 °C and with a maximum temperature of 1400 °C are fiber-insulated. It is particularly important to note that all insulation materials used are not classified as carcinogenic according to Regulation (EC) No. 1272/2008 (CLP). 

Muffle furnaces for maximum temperatures of 1300 °C are insulated with high-quality lightweight firebricks. These withstand the high-temperatures and retain heat in the furnace chamber as effectively as possible. These insulation materials are also not classified as carcinogenic. 

High-quality and well-sealed insulation is particularly important for temperature uniformity in the furnace chamber and low energy consumption. Nabertherm muffle furnaces achieve a temperature uniformity of up to +/- 5 K in the empty workspace. The workspace dimensions are smaller than the furnace chamber and can also be found in the technical data on the Nabertherm website.

Interaction between the heating elements and the batch should be avoided as much as possible. Furthermore, high-quality materials are essential for durability and low wear. Since heating elements are wear parts, their easy replacement is also of great importance.

In Nabertherm muffle furnaces up to 1200 °C, high-quality heating wires are embedded in ceramic plates, providing optimal protection against mechanical damage or interaction with the batch. The heating plates are easy to replace. Heating from two or three sides (depending on the model) enables a temperature uniformity of up to +/- 5 K in the empty workspace. If a particularly fast heating time is required, Nabertherm offers muffle furnaces up to 1100 °C in the LE... Economy product series. In these models, the heating elements are protected in quartz tubes and radiate heat freely into the furnace chamber.

For simple processes requiring only one temperature, Nabertherm offers a basic controller (R 8) where you simply enter the desired temperature, press "Start," and it's ready to go. This is part of the Economy Series LE. 

For more complex temperature profiles, Nabertherm offers standard controllers with up to 5 adjustable programs, each with 4 program steps. The optional C variant, with up to 10 programs and 20 segments, is also available. Input is intuitive via a touchscreen display with clear text readouts. Nabertherm controllers feature integrated help functionality in 24 languages.