Hot-Wall Retort Furnaces

Nabertherm Hot-Wall Retort Furnace

These gas tight retort furnaces are equipped with direct or indirect heating depending on temperature. They are perfectly suited for various heat treatment processes requiring a defined protective or a reaction gas atmosphere. These compact models can also be laid out for heat treatment under vacuum up to 600 °C. The furnace chamber consists of a gas tight retort with water cooling around the door to protect the special sealing. Equipped with the corresponding safety technology, retort furnaces are also suitable for applications under reaction gases, such as hydrogen or, in combination with the IDB package, for inert debinding or for pyrolysis processes.
Different model versions are available depending on the temperature range required for the process:

Models NRA ../06 with Tmax 650 °C

• „​Heating elements located inside the retort
• „Temperature uniformity up to +/- 5 °C inside the work space
• „Retort made of 1.4571
• „Gas circulation fan in the back of the retort provides for optimal temperature uniformity

Models NRA ../09 with Tmax 950 °C

• „Outside heating with heating elements around the retort
• „Temperature uniformity up to +/- 5 °C inside the work space s
• „Fan in the back of the retort provides for optimal temperature uniformity

Models NR ../11 with Tmax 1100 °C

• „Outside heating with heating elements around the retort
• „Temperature uniformity up to +/- 5 °C inside the work space
  
• „​Retort made of 1.4841

H2 Version for Operation with Flammable Process Gases
​When a flammable process gas like hydrogen is used, the retort furnace is additionally equipped with the required safety technology. Only certified and industry proven safety sensors are used. The furnace is controlled by a fail-safe PLC control system (S7- 300F/safety controller)

IDB Version for Debinding under Non-flammable Protective Gases or for Pyrolysis Processes
The retort furnaces of the NR and NRA product line are perfectly suited for debinding under non-flammable protective gases or for pyrolysis processes. The IDB version of the retort furnaces implements a safety concept by controlled purging the furnace chamber with a protective gas. Exhaust gases are burned in an exhaust torch. Both the purging and the torch function are monitored to ensure a safe operation.

Model	Tmax °C	Model	Tmax °C	Work Space Dimensions in MM W x D x H
NRA 17/..	650 or 950	NR 17/11	1100	225 x 350 x 225
NRA 25/..	650 or 950	NR 25/11	1100	225 x 500 x 225
NRA 50/..	650 or 950	NR 50/11	1100	325 x 475 x 325
NRA 75/..	650 or 950	NR 75/11	1100	325 x 700 x 325
NRA 150/..	650 or 950	NR 150/11	1100	450 x 750 x 450
NRA 200/..	650 or 950	NR 200/11	1100	450 x 1000 x 450
NRA 300/..	650 or 950	NR 300/11	1100	590 x 900 x 590
NRA 400/..	650 or 950	NR 400/11	1100	590 x 1250 x 590
NRA 500/..	650 or 950	NR 500/11	1100	720 x 1000 x 720
NRA 700/..	650 or 950	NR 700/11	1100	720 x 1350 x 720
NRA 1000/..	650 or 950	NR 1000/11	1100	870 x 1350 x 870

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