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In order to replace BCR CRM 064, the Institute for Reference Materials and Measurements (IRMM) has proposed to create a new European certified reference material for the thermal conductivity measurements IRMM-440.

A specific production batch of high density (72.5 kg/m-cubed) resin-bonded glass fibre boards was manufactured. Measurements were performed on the glass fibre boards of 1.200 m and 1.200 m X 35 mm nominal dimensions in order to assess the homogeneity and the stability of the batch.

Before performing the certification measurements, the six selected laboratories were requested to assess their Guarded Hot Plate apparatus. Each participant carried out the thermal conductivity measurements for the certification of the batch, according to ISO 8302 on two samples from the batch of glass fibre boards with different levels of density (low and high).

The statistical and technical analyses of the thermal conductivity measurements show that the best fit of the thermal conductivity measurements versus the mean test temperature is not a straight line (as former BRC-064) but a polynomial with second or third order temperature terms. The analyses show that the certification measurements from all the participating laboratories (except DFT for an outlying density) are acceptable. However, before computing the certified thermal conductivity values, all the measurements have been corrected from the identified systematic errors in order to reduce the statistical significant differences between the participants.

Additional information

Authors: LAMBERTY A, EC-JRC-IRMM, Geel (BE);DE PONTE F, Dipartimento di Fisica Tecnica (DFT), UniversitÓ degli studi di Padova (IT);VENUTI G, Laboratoire National d'Essais (LNE), Division Energie et Produits pour la Construction, Trappes (FR);QUIN S, Laboratoire National d'Essais (LNE), Division Energie et Produits pour la Construction, Trappes (FR)
Bibliographic Reference: EUR 19572 EN (2000) 54 pp.
Availability: Available free of charge from JRC Ispra
ISBN: ISBN 92-828-9638-2
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