ASTM C518 High-Precision Heat Flow Measurement System

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Standards

ASTM C518: Standard Test Method for Steady-State Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus.

ASTM C1784: Standard Test Method for Thermal Storage Performance of Phase Change Materials and Products Using a Heat Flow Meter Apparatus.

ISO 8301: Determination of Steady-State Thermal Resistance and Related Properties of Thermal Insulating Materials by Means of a Heat Flow Meter.

JIS A1412: Method for Determining Thermal Conductivity of Insulating Materials.

EN 12667: Thermal performance of building materials – Determination of thermal resistance by heat flow meter and guarded hot plate method for high and medium thermal resistance products.

EN 12664: Thermal performance of building materials – Determination of thermal resistance by heat flow meter and guarded hot plate method for medium and low thermal resistance dry and wet products.

Parameters

Model	Material	Sensor Type	Thermal Conductivity (W/m·K)	Specific Heat	High Conductivity Kit (W/m·K)	Sample Size (mm)	Test Time (min)	Accuracy (k)	Repeatability (k)	Plate Temp Range (°C)	Factory Calibration	Standards
HFM-1	Insulation, solids, textiles	Flux sensors (x2)	0.002–0.5	Optional	Up to 2.5	300×300×max 100	30–40	1–2%	0.5–1%	20–75	Yes	ASTM C518. C1784. ISO 8301. JIS A1412. EN 12667. EN 12664
HFM-2	Insulation, solids, textiles	Flux sensors (x2)	0.002–0.5	Optional	Up to 2.5	300×300×max 100	30–40	1–2%	0.5–1%	-30–110	Yes	ASTM C518. C1784. ISO 8301. JIS A1412. EN 12667. EN 12664
HFM-3	Insulation, solids, textiles	Flux sensors (x2)	0.002–0.5	Optional	Up to 2.5	200×200×max 50	30–40	1–2%	0.5–1%	-20–70	Yes	ASTM C518. C1784. ISO 8301. JIS A1412. EN 12667. EN 12664
HFM-4	Insulation, solids, textiles	Flux sensors (x2)	0.01–0.3	N/A	N/A	Max 300×300×25	20	3%	1%	10–75	Yes	ASTM C518. C1784. ISO 8301. JIS A1412. EN 12667

Features

Heat Flux Measurement: Thermopile-based sensors integrated with surface thermocouples; low calibration requirement improves measurement accuracy.

Temperature Control: Peltier elements provide precise heating and cooling, with temperature resolution <0.01°C for optimal thermal testing.

Thickness Measurement: Automated or manual sample thickness measurement using optical encoders with <0.05 mm accuracy, ensuring precise thermal resistance calculations.

Flexible Operation: Measurement via front control panel or HFM software on Windows; supports automated temperature steps, result export, and printing.

Clamping Control: Automatic for rigid materials; manual input for compressible materials ensures optimal contact.

Reference Materials: NIST-certified standard reference materials (SRM) included, with optional custom thermal standards for specialized applications.

Accessories

Standard reference materials (glass fiber board and EPS foam board).

Optional high thermal conductivity kit.

Sample support fixtures for small or irregular specimens.

Software package for Windows-based control and data management.

Test Procedures

Sample Preparation: Ensure parallel surfaces. Automated thickness measurement is available for rigid samples; manual input for compressible materials (~1 min).

Insert Sample: Place sample between test plates; center smaller or irregular samples (~1 min).

Close Plates: Upper plate automatically lowers; for compressible materials, stops at preset thickness. Plate briefly confirms contact to ensure measurement accuracy (~1 min).

Run Test: Choose single or progressive temperature steps; standard testing time 30–40 minutes. Results can be saved, printed, or exported to Excel.

Maintenance Information

Regularly clean sensor surfaces to prevent debris interference.

Calibrate periodically with NIST reference materials.

Inspect Peltier modules and optical encoders for mechanical wear or misalignment.

Store in a dry, dust-free environment when not in use.

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