Furnaces LHT/LB(R) are perfectly suited of sintering zirconia units. Due to the electrically driven lift bottom, they can be charged very handily. With their all-round heating of the cylindric chamber, these furnaces achieve outstanding temperature uniformity. Model LHT 02/16 LBR is specifically recommend when possible contamination is an issue. It is equipped with a ceramic retort positioned between the charge and the heating elements. This system provides for optimal protection of the zirconia crowns and bridges. The units can be placed in saggars made of technical ceramics. Up to three saggars can be charged and provide for high output. As additional equipment these furnaces can be furnished with a cooling system using compressed air which is induced to shorten the process cycle.

• Tmax 1600 °C or 1700 °C
• High-quality molybdenum disilicide heating elements
• Furnace chamber lined with first-class, durable fiber materials
• Outstanding temperature uniformity due to all-round furnace chamber heating
• Tubular plasma ceramic retort for the LBR version to prevent a certain level of contamination and to improve temperature uniformity
• Furnace chamber with a volume of 2 or 16 liters, table with large footprint
• Typical cycle time for zirconia firing at 1500 °C approx. 8 hours including cooling down
• Spacers to lift-up the saggars already installed in the table
• Precise, electric spindle drive with push button operation
• Housing made of sheets of textured stainless steel (non-rusting design)
• Adjustable air inlet through the floor
• Exhaust air vent in the roof
• Type B thermocouple
• Switchgear with thyristor

Additional Equipment

• Over-temperature limit controller with with manual reset for thermal protection class 2 in accordance with EN 60519-2 as temperature limiter to protect the furnace and load
• Saggar for charging of up to three layers
• Protective gas connection
• Manual or automatic gas supply system, particularly effective in the LBR version with retort
• Forced-Air Cooling Package for model LHT 02/LBR for shorter process cycles The forced-air cooling package can be installed in models LHT 02/16 LBR and LHT 02/17 LBR. The furnace will be equipped with a quick lock for compressed air and a valve which can be activated by means of the extra function in the controller. To protect the charge, the cooling air will be injected behind the ceramic retort in the furnace chamber. Cooling times can be cut by about 45 minutes.