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This certification report is largely based on the final report of a research project, funded by the European Community under the �Competitive and Sustainable Growth� program (�HTCRM - High Temperature Certified Reference Material�, contract SMT4-CT98-2211 [1]). The project intended to produce a reference material with certified thermal conductivity (delta) and diffusivity (alpha). Samples in the shape of cylinders with different diameter and thickness were prepared from large blocks of Pyroceram 9606.
The material was tested for homogeneity. Homogeneity was found sufficient for the intended use, and the corresponding uncertainty contribution was determined. Dispatch and storage conditions were judged non-critical for this glass-ceramic material. However, stability of the samples under repeated heating cycles to elevated temperatures needed to be investigated. An uncertainty contribution was determined based on a limited use of the CRM of 10 times heating up to 1025 K. The certified values were determined through an interlaboratory exercise. Thermal diffusivity was determined using laser-flash and Xenon lamp methods. Thermal conductivity was measured using guarded hot plate apparatus and hot-wire/hot-strip methods.

Additional information

Authors: SALMON D, National Physical Laboratory (NPL), Teddington (GB);ROEBBEN G, European Commission, Joint Research Centre, Institute for Reference Materials and Measurements, Geel (BE);LAMBERTY A, European Commission, Joint Research Centre, Institute for Reference Materials and Measurements, Geel (BE);BRANDT R, Forschungsinstitut für Kerntechnik und Enregiewandlung, Stuttgart (DE)
Bibliographic Reference: EUR 21764 EN (2006), 68 pp. Free of charge
Availability: Available from European Commission, JRC Knowledge Management Unit, Ispra (IT) Tel: +39 033278 9893 Fax: +39 033278 5409 E-mail: or Bruxelles (BE) Tel: +32 2 295 76 24 Fax: +32 2 299 63 22
ISBN: ISBN: 92-894-9920-6
Record Number: 200719182 / Last updated on: 2007-05-21
Original language: en
Available languages: en
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