Labotemp Muffle Furnace FMU-21 is a high-temperature electric muffle furnace engineered for demanding thermal processing, material analysis, sintering, ash determination, and heat-treatment applications in research laboratories, universities, industrial facilities, and mining operations. This laboratory furnace offers a maximum operating temperature of 1700°C with a recommended continuous working temperature of 1650°C, making it suitable for advanced ceramic, metallurgical, and inorganic material testing. The 6.7 L chamber is constructed with high-temperature-resistant polycrystalline mullite fiber insulation, ensuring excellent thermal efficiency, rapid heat-up performance, and reduced energy consumption. Combined with high-purity silicon molybdenum heating elements and intelligent PID control, the furnace delivers stable temperature uniformity and precise heating accuracy of ±1°C for reliable and repeatable results.
Designed for long-term laboratory use, the FMU-21 features a programmable microcomputer controller with fixed-value and multi-step program operation modes, allowing accurate process control for complex heating profiles. The robust cold-rolled steel exterior, vacuum-formed insulation structure, and double-shell ventilation design help maintain lower external surface temperatures while improving operational safety. Additional protection systems including over-temperature alarms, leakage protection, sensor fault detection, and automatic power interruption when the door opens enhance user safety and equipment reliability.
Why Choose Labotemp Muffle Furnace FMU-21?
✓ 1700°C High-Temperature Capability: Suitable for advanced sintering, calcination, and material testing applications.
✓ Energy-Efficient Insulation Design: Polycrystalline mullite fiber chamber reduces heat loss and improves thermal efficiency.
✓ Comprehensive Safety Protection: Features over-temperature alarms, leakage protection, sensor monitoring, and door-open power cutoff.
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Capacity : 6.7 L Capacity |
6.7 L |
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Temperature Range : 1700°C Temperature Range |
1700°C |
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Power Supply : AC220V / 50Hz Power Supply |
AC220V / 50Hz |
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Heating Power : 9 kW Heating Power |
9 kW |
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Temperature Accuracy : ±1°C Temperature Accuracy |
±1°C |
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Temperature Resolution Ratio : 1°C Temperature Resolution Ratio |
1°C |
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Temperature Rise Time : ≤140 min Temperature Rise Time |
≤140 min |
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Heating Element : High-temperature resistant silicon molybdenum rod Heating Element |
High-temperature resistant silicon molybdenum rod |
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Temperature Control Mode : Intelligent microcomputer PID control Temperature Control Mode |
Intelligent microcomputer PID control |
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Setting Method : Standard: 4-key settings; P Type: 5-key settings; PL Type: Touch operation Setting Method |
Standard: 4-key settings; P Type: 5-key settings; PL Type: Touch operation |
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Timer : Standard: 0–9999 min; P Type: 0–99 h 59 min; PL Type: 0–9999 min Timer |
Standard: 0–9999 min; P Type: 0–99 h 59 min; PL Type: 0–9999 min |
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Operation Function : Fixed value running or program running Operation Function |
Fixed value running or program running |
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Sensor : Type B Thermocouple Sensor |
Type B Thermocouple |
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Chamber Material : High-temperature resistant polycrystalline mullite fiber Chamber Material |
High-temperature resistant polycrystalline mullite fiber |
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Exterior Material : Cold-rolled steel plate with surface spray treatment Exterior Material |
Cold-rolled steel plate with surface spray treatment |
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Chamber Size (W×D×H) : 300 × 150 × 150 mm Chamber Size (W×D×H) |
300 × 150 × 150 mm |
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Net Weight : 110kg Net Weight |
110kg |
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Gross Weight : 130kg Gross Weight |
130kg |
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Packing Dimensions (W×D×H) : 910 × 985 × 1310 mm Packing Dimensions (W×D×H) |
910 × 985 × 1310 mm |
Volume : 4 L
Voltage: AC 220V 50Hz / 240V 60Hz
Timer: 0–9999 min
Temperature Setting Mode: Touch
Volume : 12 L
Timer: 0–9999 min
Temperature Setting Mode: Touch
Temperature Resolution : 1℃
Volume : 20 L
Timer: 0–9999 min
Temperature Setting Mode: Touch
Temperature Resolution : 1℃
Volume : 36 L
Timer: 0–9999 min
Temperature Setting Mode: Touch
Temperature Resolution : 1℃
Timer: Standard: 0–9999 min; P Type: 0–99 h 59 min; PL Type: 0–9999 min
Temperature Rise Time: ≤140 min
Temperature Resolution Ratio: 1°C
Temperature Range: 1700°C
Temperature Sensor: B-Type Thermocouple
Temperature Control: 50-Segment Programmable Digital PID Controller
Temperature Accuracy: ±1 °C
Technical Specifications:
Temperature Sensor: B-Type Thermocouple
Temperature Control: 50-Segment Programmable Digital PID Controller
Temperature Accuracy: ±1 °C
Technical Specifications:
Temperature Sensor: Thermocouple
Temperature Controller: Digital PID Controller
Temperature Control Accuracy: ±1°C
Safety Protection: Over-Temperature Protection
Time from Room Temp. to Max Temp. (min): 60
Temperature Setting Mode: Touch four keys
Temperature Resolution: 1°C
Temperature Fluctuation: ±5°C
Time from Room Temp. to Max Temp. (min): 70
Temperature Setting Mode: Touch four keys
Temperature Resolution: 1°C
Temperature Fluctuation: ±5°C
Time from Room Temp. to Max Temp. (min): 75
Temperature Setting Mode: Touch four keys
Temperature Resolution: 1°C
Temperature Fluctuation: ±5°C
Weight: 130 – 150 kg
Voltage: 110 V
Time to Max Temperature: 30 – 50 minutes
Thermocouple Type: Type K
Timing: 0–999 hours
Temperature Rising Time: 60±5 minutes
Temperature Resolution: 1°C
Temperature Controller: Touch Screen
Time from Room Temp. to Max Temp. (min): 80
Temperature Setting Mode: Touch four keys
Temperature Resolution: 1°C
Temperature Fluctuation: ±5°C
Time from Room Temp. to Max Temp. (min): 80
Temperature Setting Mode: Touch four keys
Temperature Resolution: 1°C
Temperature Fluctuation: ±5°C
Time from Room Temp. to Max Temp. (min): 80
Temperature Setting Mode: Touch four keys
Temperature Resolution: 1°C
Temperature Fluctuation: ±5°C
Timer: 0–99 h 59 min (programmable timing)
Temperature Setting: Touch button setting
Temperature Resolution: 1°C
Temperature Range: 100°C – 1200°C
Voltage: AC 220V 50Hz
Thermocouple: Type N
Temperature Accuracy: ±1°C
Structure: Bench-top, front loading
Working Temperature: 1100°C, 24/7
Thermocouple: Type N
Thermal Parameters:
Temperature Uniformity: ±5°C
Volume: 4L
Timer : 0–9999 min
Temperature Setting Mode : Touch
Temperature Resolution : 1℃
Volume : 12L
Timer: 0–9999 min
Temperature Setting Mode: Touch
Temperature Resolution : 1℃
Volume : 20 L
Timer: 0–9999 min
Temperature Setting Mode: Touch
Temperature Resolution : 1℃
Volume : 36 L
Timer: 0–9999 min
Temperature Setting Mode: Touch
Temperature Resolution : 1℃
Voltage: AC 220V, 50HZ
Thermocouple: Type K
Temperature control accuracy: ±1℃
Safety protection features: Protection for temperature deviation, over-temperature warning, phase-loss warning, and over-flow protection
Voltage: AC 220V, 50HZ
Thermo couple: Type K
Temperature control accuracy: ±1℃
Safety protection features: Protection for temperature deviation, over-temperature warning, phase-loss warning, and over-flow protection
Voltage: AC 220V, 50HZ
Thermo couple: Type K
Temperature control accuracy: ±1℃
Safety protection features: Protection for temperature deviation, over-temperature warning, phase-loss warning, and over-flow protection
Voltage: AC 220V, 50HZ
Thermo couple: Type K
Temperature control accuracy: ±1℃
Safety protection features: Protection for temperature deviation, over-temperature warning, phase-loss warning, and over-flow protection
Thermal Insulation: External Surface Temperature < 45°C
Temperature Accuracy: ±5°C
Standard Working Temperature: 538°C
Secondary Combustion Chamber Temperature: 900°C
Weight Monitoring: Continuous Electronic Balance Monitoring
Test Accuracy: ±0.11%
Temperature Control: Programmable Automatic Control
Sample Mass Capacity: Standard: 1200–1800 g; Maximum: 5000 g
Working Temperature: 1600°C, 24/7
Thermocouple: B Type
Temperature Uniformity: ±5°C
Temperature Measurement: Single-Point
