The furnace models GF 75 - GF 1050 are particularly suitable for fusing of glass. Their special construction, with infrared heating elements mounted on the ceiling and light fiber insulation, ensures fast heat-up and cool-down rates and optimum fusing or slumping results. As protected infrared heating is used, any direct contact with the heating coils is avoided. This means you can safely open the furnace during operation without the need to switch off the heating.

• Tmax 950 °C
• Infrared heating elements for short heat-up times and energy efficient operation
• Overhead heating for direct heat transfer to your ware
• Base available with either lightweight ceramic fiber modules or durable insulating bricks
• Hood insulation with special ceramic fiber for short heat-up and cool-down rates
• Solid-state power control relays for silent operation
• Fast power switching for precise temperature distribution
• Type “K” (NiCr-Ni) thermocouple inside the furnace chamber for precise temperature measurement
• Housing made of high-grade stainless steel and ventilated lid
• Attractive and professional design enhances your image
• Gas springs counterbalance the lid weight for easy opening and closing
• Adjustable quick-release locks to secure the hood during firing
• Large “cool-touch” handle for opening and closing the furnace
• Openings for fresh air and for observation with flaps, on request also available with inspection glass
• Delivered ready for operation including base frame with swivel casters and storage shelf
• For control system see page 42

The GFM series has been developed for special production requirements. Different tables are available on a modular basis. As standard version this system is delivered with a freestanding table on wheels. The system can be expanded with various table heights and numerous options. A cost saving feature is the interchangeable table system which allows to charge one table while the other one is in the furnace.

• Tmax 950 °C
• Infrared heated in hood which is atteched to stand
• Delivered with one table
• Freely movable table on wheels
• Infrared heating elements for short heat-up times and energy-saving operation
• Lid heating elements for direct radiation on the surface of the glass
• Low-noise heating operation with solid-state relays
• NiCr-Ni thermocouple inside the furnace for precise temperature measurement
• Insulation with special ceramic fibres for short heat-up and cool-down times
• Housing made from high-quality stainless steel and lid with ventilation ports (avoidance of rust formation during drying of plaster moulds)
• Attractive design and solid construction
• Gas operated dampers provide for very easy opening and closing of hood
• Adjustable locks for easy handling
• Large metal handle for opening and closing furnace
• Openings for fresh air and for observation with flaps, on request also available with inspection glass
• For control system see page 42

Additional features for fusing furnaces GF and GFM

• Automatic lid opening for faster cooling, programmable via the extra controller function, for models GF 380 and/or GFM 380 up

For complex slumping applications floor heating is needed. Therefore, we offer the washbasin slumping module WBE as an option for fusing furnaces GF and GFM. It can also be retrofitted because of its separate floor heating and independent control. When the glass reaches a defined deformation, the floor heating of the slumping module is switched-off automatically.

• Floor heating via infrared heating elements
• Heat-resistant stainless steel frame
• High quality fibre floor insulation
• Independent control of floor heating
• Adjustable switch-off for preselected basin slumping
• Carrying handles for easy mounting of the module
• Different module sizes available
• Easy handling

The multi-purpose kiln MF 140 is suitable for fusing, porcelain painting and decoration firing of glass and ceramics. Pâte de Verre techniques can also be carried out using this kiln. The heating can be adapted to your process requirements. During glass fusing, for example, the side heating is turned down and only the ceiling heating is used. Simple and compact in structure, the MF 140 is an ideal choice for individuals or for small studios.

• Tmax 1100 °C
• Table-top version (Optional base available)
• 4-sides heating from both sides, ceiling and bottom (only top heating for fusing)
• Ratio of top to side heating power adjustable
• High-quality heating elements, positioned in protective grooves
• Heating elements with long service life
• Long-life K type thermocouple
• Safety door contact switch
• Multi-layer insulation consisting of lightweight refractory bricks on the hot face and backed by fibre insulation for low energy consumption
• Exhaust air vent in the backwall, air inlet opening in the door
• For control system see page 42

A high-quality furnace is indispensable for professional glass bead tempering. The MF 5 model is the ideal furnace for cooling large glass beads or glass jewelry. For charging the glass beads, the door is equipped with a window which can be closed with a filler piece when the furnace is used for other applications. The infrared heating prevents direct contact with the heating elements so the furnace can be safely opened during operation without heating interruption.

With a maximum temperature of 950 °C, this furnace is multifunctional, and can be used for fusing and enameling applications, for decorating and for preheating frits and other materials.

• Tmax 950 °C
• Heating from furnace ceiling
• Elements protected in quartz glass tubes for safe open-door operation
• Multi-layer energy-efficient insulation
• Table-top model
• Housing made from high-quality stainless steel
• Low energy consumption
• Easy to handle
• Low-noise heating operation with solid-state relays
• Window with rack for charging glass beads
• For control system see page 42

Nabertherm markets this range of top-hat furnaces for bending and slumping of large glass parts. With varying table designs and different types of hood opening systems, these furnaces can be optimally adapted to individual processes. Heating elements from lid and table provide for good temperature uniformity.

• Tmax 900 °C
• Heating from lid and table
• 3-zone temperature control (lid-inner circular element, lid-outer circular element, table) for optimal temperature distribution
• Table heating can be switched-off for fusing
• Heating elements mounted on ceramic support tubes for free heat radiation and long service life
• Table heating elements covered by SiC tiles for level stacking support
• Hood insulated with high-quality fibre materials
• Table insulated with multiple layers of resistant, lightweight refractory bricks
• In standard version, hood is lifted by crane
• Protection guides for easy hood opening and closing
• Manually-operated vapour vent flaps
• Furnace table on fixed chassis for user-friendly charging height (800 mm)
• For control system see page 42

Optional Equipment

• Tailor-made furnaces in customized dimensions
• Hood side heating in case of high hood dimensions
• Interchangeable table system on rails, electrically powered on request (see page 13 for details)
• Electro-hydraulically driven hood
• Cooling system (see page 11 for details)
• Table on wheels for free movement
• Automatically driven vapour vent flaps

For slumping and bending of complex glass parts, e.g. glass furniture, shower cabins, etc., tub furnaces are the right choice. Full coverage heating: from the lid, all 4 sides and the tub bottom. Due to the modular system additional tubs in customized dimensions can be provided.

• Tmax 900 °C
• Full coverage heating: from lid, all 4 sides and bottom
• 3-zone temperature control from top to bottom for optimal temperature distribution
• Heating elements mounted on ceramic support tubes for free heat radiation and long service life
• Table heating elements covered by SiC tiles
• Hood insulated with high-quality fibre materials
• Tub bottom insulated with multiple layers of insulation, lightweight refractory bricks on the hot face
• Hinged hood as standard version
• Gas operated dampers provide for easy hood opening
• Manually operated vapour vent flaps
• Tub on wheels can be pulled out manually
• Rails on floor for perfect tub guidance included
• For control system see page 42

Additional Features

• Furnaces tailor-made to individual customer measurements
• Interchangeable table system on rails, electrically driven on request (see page 15 for details)
• Electro-hydraulically driven hood instead of hinged cover
• Tub insert to elevate bottom height, in order to use the furnace for glass fusing applications (in this product version the tub heating can be switched off

Additional Features

• Automatic lid opening for faster cooling, programmable via the Controller extra function
• Automatically driven vapour vent flaps in the hood for preselected cooling
• Powerful cooling system An efficient fan system, mounted to the furnace, cools the double-walled housing from the back. This system shortens cooling times by up to 50 % subject to cycles and charge. Direct contact between the cooling air and charge, hence turbulences in the firing chamber are avoided, protecting the glass from any damage.
• Interchangeable table system running on rails To shorten process times and optimise operational capacity, two or more furnace tubs, placed alternately under the hood, can be used. An automatic tub changing system is also available on request.

These top-hat furnaces were specially developed for cooling complex structures or when the process requires the treatment of warm glass, e.g., the welding process in glass apparatus manufacturing. The wide-opening electro-hydraulically driven hood allows furnace opening even at high temperatures and provides easy access from 3 sides.

• Tmax 1280 °C
• Very high temperature uniformity through 5-sides heating
• Multi-layer, high-quality insulation
• Heating elements mounted on support tubes for free heat radiation inside the furnace
• Electro-hydraulically driven for practically vibration-free opening
• Bottom heating elements protected by SiC tiles
• Easy charging from 3 sides
• Table working height: 800 mm
• Hood safety switch
• For control system see page 42

Optional Equipment

• Manually or electrically operated interchangeable table system to shorten process times
• Customized dimensions
• Controlled fan cooling system: the preset cooling curve will be carried out exactly via variable fan speed
• Automatically driven vapour vent flaps
• Multi-zone control for optimal temperature distribution
• Completely automatic process control and documentation

For temperatures beyond 1350 °C we recommend furnaces with SiC rod heating. The top-hat construction with 4-sides heating provides for exceptional temperature uniformity.

• Tmax of 1400 °C, 1450 °C or 1500 °C
• SiC rod heating on 4 sides of the furnace hood for short cycle times and high temperature uniformity
• High electrical connected power for short cycle times
• Hood insulation made from fibre materials provides for short cycle time and low energy consumption
• Table built from lightweight refractory bricks allows for heavy loads and level stacking surface
• Electro-hydraulic driven hood for vibration-free opening and closing of furnace hood
• Thyristor powered heating
• For control system see page 42

These high-quality chamber kilns are suitable for heavy duty jobs in glass industry. These models can ideally be used for cooling, bending/slumping and glass decoration.

• Tmax 900 °C, 1300 °C, 1340 °C or 1400 °C
• 5-sides heating for excellent temperature uniformity
• Available as 900 °C version for decorating, bending/slumping and cooling; for higher temperatures of up to 1400 °C for sintering/tempering of special glass
• Heating elements on support tubes provide for free heat radiation and long service life
• Vapour vent in the middle of the roof (excellent ventilation)
• Smoothly adjustable and easy-to-operate air inlet flap or sliding damper
• Self-supporting roof arch provides for high stability and maximum protection from dust contamination
• Double-walled, non-warping door with fibre seal (from model N 440..) or brick on brick for models N 100.. to N 300..
• Special door lock for easy handling
• Multi-layer insulation consisting of lightweight refractory bricks and backed by special fibre insulation
• Fibre insulation instead of bricks for fast process cycles available as option
• Models up to N 300/.. are supplied with a removable stand
• Floor heating elements protected by SiC tiles to provide for level stacking floor
• For control system see page 42

Standard Version and Optional Equipment

SiC floor plate easy to remove for cleaning of furnace bottom.

Smoothly adjustable air inlet flap for optimal air supply during the firing process and short cooling times. Automatic drive available as an option. (N 100/G - N 300/14)

Double-walled housing for low outside temperatures – with side panels made from structured, stainless steel (N 100/G - N 660/14).

Optional Equipment: Loading rack for chamber kilns. The rack charged with goods is loaded into the kilns using a pallet truck. (N 100/G - N 660/14)

Free heat radiation through heating elements on ceramic support tubes; optimal positioning of heating elements for excellent temperature distribution.

Shuttle kilns offer many advantages for cooling, decorating or sintering special glass in production. The shuttle can be loaded outside the furnace. Several shuttles can be used, so that one shuttle can be charged while the other shuttle is in the kiln.

• Tmax 900 °C, 1280 °C, 1340 °C or 1400 °C
• 5-Sides heating: all four sides and shuttle
• Automatic power contact of shuttle when moved into the kiln
• Heating elements mounted on support tubes for long service life
• Floor heating protected by SiC tiles on the bogie providing level stacking floor
• Multi-layer insulation consisting of lightweight refractory bricks and backed by special fibre insulation
• Side walls and door are doubled-walled with result of low outside temperatures
• Self-supporting roof arch
• Freely moving shuttle with rubber tires
• Adjustable air inlet damper as standard
• Vapour vent in the furnace roof
• For control system see page 42