1200°C Electric Stack Furnace for Laboratory Heat Treatment

Product Description

The 1200°C electric stack furnace delivers high-temperature performance with stable control and efficient heat distribution. Its compact stacked design maximizes space use while ensuring reliable operation for heat treatment and material processing applications.

Product Features

Furnace body structure

The electric furnace features an advanced air-cooled double-layer structure designed for efficient thermal management. Internal guide baffles direct cold air circulation throughout the shell, ensuring continuous and balanced cooling.
This system effectively lowers the temperature of heating element connection plates before heat is discharged, preventing high-temperature oxidation and extending component lifespan. By maintaining a controlled external temperature, it also improves operational safety and creates a more stable working environment.
The optimized cooling design enhances reliability, reduces maintenance requirements, and supports long-term performance in demanding high-temperature applications.

Refractory materials

The furnace lining is constructed with 1400-grade vacuum-formed high-purity alumina fiber boards, providing excellent thermal resistance and lightweight insulation. This advanced material ensures stable performance at elevated temperatures while minimizing heat loss.
High-wear areas such as the furnace bottom are reinforced with a combination of high-purity lightweight alumina bricks and fiberboard, enhancing durability and resistance to mechanical impact. The structure supports rapid heating and cooling without cracking or deformation.
With low thermal storage and superior insulation efficiency, the system significantly reduces energy consumption, achieving over 80% energy savings compared to conventional electric furnaces, while maintaining consistent and reliable high-temperature operation.

thermal insulation materials

The insulation system adopts a multi-layer composite structure combining nano insulation boards, 1200-grade alumina fiberboards, and 1420 high-temperature fiberboards. This advanced configuration enhances thermal resistance and minimizes heat transfer losses.
The layered design creates an efficient barrier against heat dissipation, maintaining stable internal temperatures while reducing external surface heat. It also improves overall thermal efficiency and supports consistent high-temperature operation.
Compared with conventional electric furnaces, this optimized insulation solution reduces energy consumption by over 60%, delivering significant cost savings and improved environmental performance for industrial heating applications.

Specifications

category parameter	1200 degrees
model	GWL-1200LDZ
Main heating chamber dimensions	600×600×1500mm
Main heating chamber power	Design power 75kW, automatically adjusted according to heating rate.
AC power	Three-phase five-wire 380V
Maximum operating temperature	1200 degrees
Long-term operating temperature	1150 degrees
The control range is	80 to 1200 degrees
Temperature sensing element	Type K thermocouple, temperature measurement range 0-1320 degrees Celsius
Heating element mounting position	Installed around the inner wall of the furnace, with three independent temperature control layers in total.
Temperature control area	The heating zone uses three temperature control points, one above and one below.

Temperature monitoring point

Six channels, including thermocouples

Temperature control accuracy

±1 degree (integrated circuit control, no overshoot)

Furnace temperature uniformity

±3-5 degrees (depending on furnace size)

heating rate

The heating rate is freely adjustable, with an adjustment range of: maximum heating rate of 30 degrees Celsius per minute (non-heating rate).

(Linear) , slowest heating rate is 1 degree per hour (1 degree/h)

Heating element

High-temperature alloy resistance wire (containing molybdenum) is used.

air intake

Four air inlets (D12mm) are arranged at the top, middle, and bottom of the furnace.

Furnace body

The furnace body is machined using CNC machine tools, and undergoes polishing, grinding, pickling, phosphating, and powder coating.

Made through high-temperature baking, it boasts a novel and attractive appearance, possessing advantages such as oxidation resistance, acid and alkali resistance, corrosion resistance, high-temperature resistance, and easy cleaning. It is of export quality with a mirror-finish paint finish.

Furnace body structure

The electric furnace body adopts an internationally advanced air-cooled double-layer furnace body structure. Effective air-cooling guide baffles enable overall cold air circulation in the furnace shell, ultimately cooling the conductive plates of the heating elements before they are discharged from the furnace body.

This avoids high-temperature oxidation of the conductive sheets in the heating element and ensures a good working environment.

Furnace opening method

The furnace chamber is designed to be openable for easy replacement of heating elements and mounting of workpieces.

Furnace opening and charging platform refractory matching

combine

The furnace opening and the charging platform are fitted with a stepped, cross-sealed refractory material, with angles on both the top and bottom of the refractory material.

The opening angle of the loading platform increases, and the closing angle of the loading platform gradually decreases.

Load capacity of loading platform

500KG (customizable according to customer requirements)

Refractory materials

The furnace lining uses 1400 -type vacuum-formed high-purity alumina fiber lightweight board material. Areas prone to material handling ( furnace bottom ) utilize a mixture of high-purity lightweight alumina bricks and fiberboard. This material offers high operating temperature, low heat storage, resistance to rapid heating and cooling, and good insulation performance ( energy-saving effect is superior to older models).

(More than 80% of electric furnaces)

thermal insulation materials

The insulation layer consists of: nano-board, 1200 alumina fiberboard, and 1420 type fiber.

The energy-saving effect of the plate is more than 60% that of the old-fashioned electric furnace.

Furnace shell temperature

For long-term use without shutting down the furnace, the outer casing temperature should be less than 45 degrees Celsius.

Protect

It adopts an integrated modular control unit, ensuring accurate control precision. It also features dual-loop control and dual-loop protection, providing protection against overshoot, over-adjustment, under-adjustment, thermocouple interruption, phase loss, and overvoltage.

Overcurrent, overtemperature, current feedback, soft start protection, etc.

control

Employing closed-loop technology with thyristor module trigger control and phase-shift trigger control, the output voltage , current, or power is continuously adjustable, exhibiting constant voltage, constant current, or constant power characteristics. The current loop is the inner loop, and the voltage loop is the outer loop. When a sudden load is applied or the load current exceeds the current limit, the output current of the voltage regulator is limited to the rated current range, ensuring normal operation of the output and the voltage regulator. Simultaneously, the voltage loop also participates in regulation, limiting the output current of the voltage regulator to the rated current range, maintaining constant output current and voltage with sufficient adjustment margin. This protects the heating elements from excessive current and voltage.

Impact, to achieve safe and reliable control effect and control accuracy.

Display parameters

Temperature, temperature range number, time period, remaining time, output power percentage, voltage,

Current, etc.

Multiple curve inputs	Multi-segment program control function, allows input of settings; can simultaneously input multiple curves, and use... It can be called at any time.
Random accessories	A set of gaskets for the relevant pipelines, and an electronic instruction manual.
Warranty coverage and period	The electric furnace comes with a one-year free warranty, but the heating element is not covered by the warranty.
Precautions	1. To avoid affecting the lifespan of the electric furnace, we recommend a maximum heating and cooling rate of 10-20℃/min (too rapid heating will shorten the lifespan of the heating element). 2. This electric furnace does not use a vacuum sealing structure, so flammable and explosive gases must not be introduced. 3. After a period of use, minor cracks may appear in the furnace chamber of this electric furnace. This is normal and will not affect its use. It can be repaired with an alumina coating. 4. It is not recommended to introduce corrosive gases. If you need to introduce highly corrosive gases such as S or Na, please inform us in advance so that we can perform special treatment on the furnace. 5. High-temperature solution must not leak onto the furnace bottom. To prevent this, a pad or alumina powder can be used for isolation. 6. The instrument should be placed in a well-ventilated, dry place.
Packing list	One electric furnace, one instruction manual, one certificate of conformity, one acceptance report ( factory inspection report ) , and one sales delivery note.

1.2 Technical parameters of the auxiliary heating chamber:

category parameter	1000 degrees
model	GWL-1200LDZ
Main heating chamber dimensions	500×500×1500mm
Main heating chamber power	Design power 45kW, automatically adjusted according to heating rate.
Pipe material and flange material	SUS310S stainless steel pipe, internal pressure 5000Pa
AC power	Three-phase five-wire 380V
Maximum operating temperature	1000 degrees
Long-term operating temperature	950 degrees
The control range is	80 to 1200 degrees
Temperature sensing element	Type K thermocouple, temperature measurement range 0-1320 degrees Celsius
Heating element mounting position	Installed around the inner wall of the furnace
Temperature control area	The heating zone uses one temperature control point at both the top and bottom.
Temperature control accuracy	±1 degree (integrated circuit control, no overshoot)
heating rate	The heating rate is freely adjustable, with an adjustment range of: maximum heating rate of 20 degrees Celsius per minute (non-heating rate). Linear), slowest heating rate 1 degree per hour (1 degree/h)
Heating element	High-temperature alloy resistance wire (containing molybdenum) is used.
Refractory materials	The furnace lining uses 1400 -type vacuum-formed high-purity alumina fiber lightweight board material. Areas prone to material handling (furnace bottom) utilize a mixture of high-purity lightweight alumina bricks and fiberboard. It has a high operating temperature, low heat storage capacity, resistance to rapid heating and cooling, and good thermal insulation performance (its energy-saving effect is superior to older models).