In a furnace, the hot zone is crucial for the temperature distribution, the cleanliness of operations and the energy consumption of high temperature processes. Three equipment packages — basic, premium and enerzone — are designed to meet differing customer requirements. In the basic hot zone package, the main materials are pure molybdenum and steel. This package is designed for moderate application conditions and frequency of use. The premium hot zone includes a number of material alloys that permit a particularly long service life and dimensional stability. The enerzone hot zone offers good energy efficiency due to its many additional layers of shielding and lightweight construction. All-metal hot zones are used at high temperatures of more than 1832°F (1000°C).