These models are ideal for simulation of typical fast-firing processes up to a maximum firing temperature of 1300 °C. The combination of high performance, low thermal mass and powerful cooling fans provides for cycle times from cold to cold of under 35 minutes.

• Tmax 1300 °C
• Very compact design
• Ceramic grid tubes as charge support
• Floor and lid heating
• Two-zone control, bottom and lid
• Integrated cooling fans, automatically programmable to speed up charge cooling including housing cooling
• Programmable lid opening of approximately 20 mm for faster cooling without activating the fan
• Thermocouple PtRh-Pt, type S for top and bottom zone
• Castors for easy furnace moving

The furnace chamber of the gradient furnace GR 1300/13 is divided in six control zones of equal length. The temperature in each of the six heating zones is separately controlled. The furnace is usually charged from the side through the parallel swivel door. A maximum temperature gradient of 400 °C can then be stabilized over the heated length of 1300 mm. On request the furnace also is designed as a strand furnace with a second door on the opposite side. Other available additional equipment consists of fiber chamber separators dividing the furnace chamber into six equally sized chambers. Charging then occurs from above by opening the large lid.

• Tmax 1300 °C
• Heated length: 1300 mm
• Heating elements on support tubes providing for free heat radiation in the kiln chamber
• Charging from the top or through the right side door
• Gas damper suspension of the lid
• 6-zone control
• Separate control of heating zones (each 160 mm long)
• Temperature gradient of 400 °C over the entire length of the kiln chamber, each zone can individually be controlled

Additional equipment

• Up to ten control zones
• Fiber separators dividing the chamber in six equally sized chambers
• Second parallel swivel door for use as conveyor furnace
• Vertical instead of horizontal strand furnace

The LH 15/12 - LF 120/14 laboratory furnaces have been trusted for many years as professional chamber furnaces for the laboratory. These furnaces are available with either a robust insulation of light refractory bricks (LH models) or with a combination insulation of refractory bricks in the corners and low heat storage, quickly cooling fibre material (LF models). With a wide variety of optional equipment, these models can be optimally adapted to your processes.

• Tmax 1200 °C, 1300 °C, or 1400 °C
• Five-sided heating for very good temperature uniformity
• Heating elements on support tubes ensure free heat radiation and a long service life
• Protection of bottom heating and flat stacking surface provided by embedded SiC plate in the floor
• LH models: multilayered, fibre-free insulation of light refractory bricks and special backup insulation
• LF models: high-quality fibre insulation with corner bricks for shorter heating and cooling times
• Door with brick-on-brick seal, hand fitted
• Short heating times due to high installed power
• Side vent with bypass connection for exhaust pipe
• Self-supporting arch for high stability and greatest possible protection against dust
• Quick lock on door
• Freely adjustable air slide intake in furnace floor
• Stand included

Additional equipment

• Parallel swinging door, pivots away from operator, for opening when hot
• Lift door with electro-mechanic linear drive
• Separate wall-mounting or floor standing cabinet for switchgear
• Automatic vent flap
• Cooling fan for shorter cycle times
• Protective gas connector, sealed housing
• Retort made of quartz glass for very clean atmosphere, quartz glass covered door with lid function
• Manual or automatic gas supply system
• Scale to measure weight reduction during annealing

These powerful laboratory muffle furnaces are available for temperatures up to 1400 °C, 1500 °C, or 1600 °C. The durability of the SiC rods in periodic use, in combination with their high heating speed, make these furnaces to all-rounders in the laboratory. Heating times of 40 minutes to 1400 °C can be achieved, depending on the furnace model and the conditions of use.

• Tmax 1400 °C, 1500 °C, or 1600 °C
• High-quality fibre material, selected for the working temperature
• Housing made of sheets of textured stainless steel
• Double-walled housing for low external temperatures and high stability
• Optional flap door (HTC) which can be used as work platform or lift door (HTCT) with hot surface facing away from the operator
• Adjustable air intake opening in the furnace door, exhaust air opening in the back wall
• Switching system with solid-state-relays, power tuned to the SiC rods
• Easy replacement of heating rods

Additional equipment

• Over-temperature limit controller with manual reset for thermal protection class 2 in accordance with EN 60519-2 as temperature limiter to protect the oven and load
• Square saggar for charging of up to three layers
• Spacer recommended to be placed under the bottom saggar for better temperature uniformity
• Manual or automatic gas supply system

Designed as tabletop models, these compact high-temperature chamber furnaces have a variety of advantages. The first-class workmanship using high-quality materials, combined with ease of operation, make these furnaces all-rounders in research and the laboratory. These furnaces are also perfectly suited for the sintering of technical ceramics, such as zirconium oxide dental bridges.

• Tmax 1600 °C, 1750 °C, or 1800 °C
• High-quality molybdenum disilicide heating elements
• Furnace chamber lined with first-class, durable fibre material
• Housing made of sheets of textured stainless steel
• Double-walled housing with additional fan cooling for low surface temperature
• Furnace sizes of 2, 4, or 8 liters
• With lift door, whereby the hot side is away from the operator
• Adjustable air inlet
• Exhaust air opening in the roof
• Type B thermocouple
• Switching system with phase-angle firing thyristors (SCRs)

Additional equipment

• Over-temperature limit controller with manual reset for thermal protection class 2 in accordance with EN 60519-2 as temperature limiter to protect the oven and load
• Square saggar for charging of up to three layers
• Spacer recommended to be placed under the bottom saggar for better temperature uniformity
• Protective gas connection
• Manual or automatic gas supply system

The electrically driven lift-bottom considerably facilitates charging of the LHT/LB(R) furnaces. 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. A ceramic retort between the charge and the heating elements optimally protects the furnace against chemical contamination. The load 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
• Heating from all around for good temperature uniformity
• 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
• 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
• 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 manual reset for thermal protection class 2 in accordance with EN 60519-2 as temperature limiter to protect the furnace and load
• Square 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.

These furnaces were specially developed to determine combustion loss during annealing and for thermographic analysis (TGA) in the lab. The complete system consists of the high-temperature furnace for 1600 °C or 1750 °C, a table frame, precision scale with feedthroughs into the furnace and powerful software for recording both the temperature curve and the weight loss over time.

• Technical description of the furnaces: see models LHT 04/16 and LHT 04/17