High Temperature & Heat Insulation

In the heat treatment workshops of industrial production and laboratories of scientific research institutes and universities, box-type electric furnaces act as core high-temperature processing equipment, undertaking key processes such as material sintering, metal annealing, and sample calcination. Their high-temperature resistance, inner tank quality, and heat insulation performance directly determine process accuracy and the reliability of experimental data. Shanghai Guanding Industrial Equipment Co., Ltd., a professional player in the industrial electric furnace industry, relies on mature manufacturing technology and strict quality control to produce Guanding box-type electric furnaces. These furnaces precisely meet the core needs of industrial procurement and scientific research experiments, and have become the preferred equipment for high-temperature processing scenarios in various industries due to their stable high-temperature performance and efficient energy-saving features.

High-temperature resistance is the core competitiveness of box-type electric furnaces and one of the key advantages of Guanding box-type electric furnaces. To cater to the diverse needs of industrial production and scientific research experiments, Guanding box-type electric furnaces cover a full temperature range, from room temperature to above 1800℃. Specifically, the rated temperature of conventional industrial models ranges from 800℃ to 1600℃, while scientific research-grade ultra-high temperature models can exceed 1800℃, even reaching above 2000℃, which is capable of meeting high-temperature process requirements across different industries [1]. Unlike ordinary electric furnaces that only withstand high temperatures for a short time, Guanding box-type electric furnaces can operate stably in the rated temperature range for a long time through optimized heating element and furnace structure design. The long-term service temperature is only 50-100℃ lower than the maximum instantaneous temperature, which effectively prevents rapid aging of heating elements and furnace materials, extends equipment service life, and adapts to the high-frequency use needs of continuous industrial production and long-term scientific research experiments [1]. This excellent high-temperature resistance stems from Guanding’s strict selection of core components. Depending on the temperature range, adaptive heating elements such as nickel-chromium alloy, iron-chromium-aluminum alloy, silicon carbide rods, and molybdenum disilicide rods are adopted. Among them, molybdenum disilicide rods selected for high-temperature models can stably withstand 1750℃, and a protective quartz film can be formed on the surface in an oxidizing atmosphere, greatly improving high-temperature stability [5].

As the core component of box-type electric furnaces that directly contacts high temperatures, the selection of inner tank materials directly affects the equipment’s high-temperature resistance and process stability. Guanding box-type electric furnaces adhere to industry standards as the foundation and strictly comply with the requirements of GB/T 10067.44-2014 "Basic Technical Conditions for Electric Heating Devices - Part 44: Box-type Resistance Furnaces" [4], equipping high-quality inner tank materials suitable for different temperature levels and application scenarios. Medium and low-temperature models (room temperature - 1200℃) adopt refractory fiber or light refractory bricks as inner tanks, which have both high-temperature resistance and lightweight advantages, suitable for conventional processes such as material drying and low-temperature annealing [1]. High-temperature models (1200℃ - 1600℃) use high-purity alumina or polycrystalline mullite fiber inner tanks, featuring outstanding high-temperature resistance to meet high-temperature needs such as ceramic sintering and metal melting [1]. Scientific research-grade ultra-high temperature models are equipped with corundum or silicon carbide inner tanks, combined with tungsten wire or graphite heating elements, which can withstand extreme high temperatures above 1600℃, adapting to high-end scientific research scenarios such as cutting-edge material synthesis and special metallurgy [1]. All inner tanks of Guanding box-type electric furnaces undergo high-temperature aging treatment, with the characteristics of resistance to rapid cooling and heating, not easy to crack, and no impurity volatilization, which can effectively avoid pollution of processed samples or workpieces by inner tank materials and ensure the accuracy of process precision and experimental data [5].

Good heat insulation performance can not only improve the energy-saving effect of box-type electric furnaces but also ensure the uniformity of internal furnace temperature and reduce the impact of temperature fluctuations on processes. Guanding box-type electric furnaces adopt a double-layer furnace shell design: the outer layer is a high-strength steel structure, and the inner layer is laid with multiple layers of high-efficiency heat insulation materials outside the inner tank to form an all-round heat insulation system [5]. The heat insulation layer is made of high-quality materials such as aluminum silicate fiber and polycrystalline mullite fiber, which have low thermal conductivity and excellent heat insulation performance. This design can effectively reduce heat leakage from the furnace, lower energy loss, and achieve significant energy-saving effects compared with traditional electric furnaces [3]. Meanwhile, Guanding optimizes the furnace door sealing structure, adopting high-temperature silicone rubber seals and equipped with safety interlock devices to ensure good sealing after the furnace door is closed. This not only prevents operators from being burned by heat leakage but also maintains stable internal furnace temperature, controlling the internal temperature difference within a reasonable range to ensure the consistency of processing effects of different batches of workpieces or samples [5]. In addition, the furnace shell undergoes special heat dissipation treatment, and the surface temperature can be controlled below 50℃ during operation, improving the operating environment and enhancing the safety of equipment use [5].

With excellent high-temperature performance, high-quality inner tanks, and efficient heat insulation effects, Guanding box-type electric furnaces are widely used in various industries and scenarios, accurately meeting the core needs of target groups such as industrial enterprise purchasers, scientific research institutes, and university laboratories. In the field of industrial production, Guanding box-type electric furnaces are mainly used for heat treatment of precision parts, production and quality inspection of special materials. They can complete processes such as annealing, quenching, and tempering of metal workpieces to improve the hardness and toughness of parts. They can also be used for ceramic sintering, powder metallurgy product sintering, refractory material testing, etc., to meet the production needs of daily-use ceramics, industrial ceramics, refractory metal products, and other products [2][7]. In the field of scientific research and experiments, Guanding box-type electric furnaces are basic experimental equipment in universities and scientific research institutes, which can be used for material science experiments, chemical and environmental experiments, geological and metallurgical experiments, such as new material synthesis, catalyst activation, sample ashing, ore analysis, etc., providing researchers with a stable and controllable high-temperature experimental environment [2][3]. In addition, in the fields of environmental protection and new energy, Guanding box-type electric furnaces can also be used for biomass pyrolysis, hazardous waste treatment experiments, etc., adapting to diverse high-temperature processing needs [2].

As a professional manufacturer in the industrial equipment field, Shanghai Guanding Industrial Equipment Co., Ltd. has always taken technology as the core and quality as the foundation, deeply integrating industry standards with actual application needs. The produced Guanding box-type electric furnaces not only perform outstandingly in core indicators such as temperature control, inner tank quality, and heat insulation effect but also have the advantages of easy operation, friendly maintenance, and environmental protection [3]. The equipment is equipped with an intelligent PID digital display temperature control instrument, combined with a thermocouple temperature sensor, which can realize precise temperature control with a temperature error of about ±1℃. It supports multi-stage heating and constant temperature setting, reducing manual intervention [3][5]. The integrated box design features an intuitive operation panel, with reasonably arranged heating elements that are easy to replace, reducing daily maintenance costs [3].

For industrial enterprise purchasers, the stable performance of Guanding box-type electric furnaces can reduce the impact of equipment failures on production, and the efficient energy-saving characteristics can lower long-term operating costs. For researchers in scientific research institutes and university laboratories, the precise temperature control and temperature uniformity of the equipment can ensure the repeatability of experimental data, adapting to the needs of various high-end scientific research experiments. With solid product quality, Guanding box-type electric furnaces have become an important bridge connecting industrial production and scientific research innovation, providing reliable equipment support for high-temperature processing scenarios in various industries.

References:

[1] Derenai (Shanghai) Electric Furnace Co., Ltd. What is the operating temperature range of laboratory box-type resistance furnaces [EB/OL]. Chemical Instrument Network, 2025-07-30.

[2] Derenai (Shanghai) Electric Furnace Co., Ltd. What are the application ranges of box-type high-temperature electric furnaces [EB/OL]. Chemical Instrument Network, 2025-08-25.

[3] Longkou Wentai Electric Furnace Manufacturing Co., Ltd. High-efficiency Box-type Resistance Furnace: A "High-temperature Accelerator" for Industry and Scientific Research [EB/OL]. 2026-01-15.

[4] Standardization Administration of the People's Republic of China. GB/T 10067.44-2014 Basic Technical Conditions for Electric Heating Devices - Part 44: Box-type Resistance Furnaces [S]. 2014-05-01.

[5] Chemical Instrument Network. Principle, Structure and Application of Box-type Electric Furnaces [EB/OL]. 2026-02-06.

[6] Instrument Network. What are the main types and applicable scenarios of box-type high-temperature electric furnaces [EB/OL]. 2026-03-19.

[7] Zhengzhou Saireda Kiln Co., Ltd. Which industrial fields are box-type resistance furnaces suitable for [EB/OL]. 2025-07-29.