b'Test Report XC3945/R1Final Issue (Rev C) Thermal transmission properties of 50mm EPS-FR board (SL grade)1.2Apparatus The measurements were performed using a FOX600 heat flow meter apparatus which has 600 mm square plates and fully encloses the test specimen.The apparatus incorporates two heat flow meters, one in each plate.Each heat flow meter is 254 mm square. Calibration checks traceable to IRMM or NIST Standard Reference Materials have been performed within 30 days of the reported measurements. 1.3Specimen Preparation and Measurement Details Each specimen was conditioned at 23C and 50% RH for a period of at least 24 hrs prior to measurement.During measurement, laboratory ambient temperature was 23 C. Due to the uniformity and rigidity of the EPS board, the mean thickness of the specimen was determined from the average of 4 corner measurements obtained from the FOX 600 instrument. 1.4Methodology The specimens were measured in accordance with ASTM C518-21The apparatus was horizontal with heat flow direction upwards and the cold plate at the top. Monitoring continued for the stated measurement duration, by which time heat flow through the specimen had stabilized. 1.5Operational Test Range The FOX600 apparatus and the test method ASTM C 518-21 place limitations on the measurement range for thermal resistance, thickness, and temperature.Measurement uncertainty is affected according to where in the range the measured properties occur.Uncertainties for thermal values have been calculated and are given adjacent. CSIRO 2023Commercial-in-Confidencepage 5 of 9 Copying or alteration of this report without written authorisation from CSIRO is forbidden. This report may only be reproduced in full.'