Test Results Thermal Resistance of an Insulation Sample

Thermal Resistance of an Insulation Sample


NRG Building Systems Pty Ltd, 30 Binary Street, Yatala, QLD 4207, Australia


The test equipment used was a LaserComp Fox 600 heat flow meter. The specimen for testing is placed horizontally in the apparatus, with upwards heat flow. The hot and cold plates each have a 250 mm x 250 mm heat flux transducer embedded in their surface. The edges of the specimen are insulated from the room ambient temperature.


The specimen was supplied by the client and consisted of one piece of light green polystyrene. The dimensions of the sample were 595 x 595 mm. It was tested at its actual thickness, to the requirements of ASTM C518-04.


Nominal Upper Plate Temperature 13 °C
Nominal Lower Plate Temperature 33 °C
Nominal Difference in Temperature 20 K
Nominal Mean Temperature 23 °C
Calibration check 20-Apr-09, EPS 01
BRANZ reference D4393
‘grams per sq. metre’ 1325
Sample weight gram 469
Test date 22-Apr
Test thickness mm 72.7
Density kg/m3 18.2
Temperature difference K 20.0
Mean temperature °C 23.0
Heat-flux W/m2 10.67
Thermal resistance (for four pieces) m2K/W 1.874
Thermal conductivity W/mK 0.0388
Difference between heat flux transducers % 0.1

These measurements comply with the requirements of ASTM C518. The uncertainty in the measurements of thermal conductivity and thermal resistance are estimated to be ± 3%.


ASTM C518-04 Standard Test Method for Steady-State Heat Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus.
American Society for Testing and Materials, Philadelphia, PA, 2004.