Flow measuring instrument HFM 706 Lambda® Medium

thermal conductivityfor polymer samplescalibration

Product overview

• NETZSCH HFM 706 Lambda Medium is a table-top heat flow meter for precise determination of thermal conductivity (λ) and thermal resistance of medium-size specimens (max. 305 mm × 305 mm × 105 mm).
• Suitable for insulation materials, polymers, building materials, phase change materials (PCMs), aerogels, nonwovens, VIPs and other low- to medium-conductivity materials.

Key features

• Dual high-sensitivity heat flux transducers for continuous monitoring of heat flow on both sample faces.
• Peltier-based bidirectional plate temperature control enabling both heating and cooling with fast stabilization.
• External cooling system to extend plate temperature range and improve stability.
• Motorized plate movement and motor-driven door for high sample throughput and easy handling.
• Optional dry-gas purge in the sample chamber to minimize condensation and stabilize measurement conditions.
• Measurement of specific heat capacity (cp) by step method as complementary thermal characterization.

Operation and software

• Integrated NETZSCH Proteus® software with SmartMode for guided workflows, wizards, user-defined methods and report generation.
• Functions include AutoCalibration, MultiCalibration, save/reuse calibration and measurement files, λ90/90 reports, measurement history and export to Word/Excel/full data export.
• Factory calibrations using certified reference materials; NIST SRM reference values available in software.

Energy efficiency & operating modes

• Programmable Eco and Idle modes: Eco disables plate control and cooler for reduced energy use during long idle periods; Idle keeps cooler at low power for rapid restart.
• Scheduler allows customization of activation times to optimize energy use and throughput.

Calibration & quality control

• Support for international standards and methods (e.g. ASTM C518, ISO 8301, JIS A1412; DIN EN 12667 / DIN EN 12664 depending on variant).
• NETZSCH factory-validated calibration routines and option to verify with NIST SRM materials.

Technical specifications
Brand: NETZSCH
Model: HFM 706 Lambda Medium
Type: Table-top heat flow meter
Standards (supported): ASTM C518; ISO 8301; JIS A1412; DIN EN 12667 (variant-dependent)
Thermal conductivity range (typ.): 0.007 – 2 W/(m·K) (expandable with optional set)
Plate temperature range: Standard -20 °C to 90 °C (optional -30 °C to 90 °C)
Heat flux sensor area: 102 mm × 102 mm
Max specimen dimensions (Medium): 305 mm × 305 mm × 105 mm
Contact force range: 0–1930 N (≈21 kPa at 305×305 mm) – force-controlled / Drive-to-Thickness available
Thermocouples: 3 per plate (Type K); resolution ±0.01 °C
Cooling: external temperature-controlled system
Special functions: Peltier heating/cooling, Drive-to-Thickness, AutoCalibration, MultiCalibration, λ90/90 reporting, SmartMode software, cp measurement