International Comparison of Guarded Hot Plate laboratories. (General Developments).NIST (National Institute of Standards & Technology, Washington, DC, www.nist.gov) The standards-defining agency of the U.S. government, formerly the National Bureau of Standards. It is one of three agencies that fall under the Technology Administration (www.technology. has published Technical Note 1444, International Comparison of Guarded Hot Plate Apparatus Using National and Regional Reference Materials, culminating a 5 year effort to compare measurement results from five national metrology laboratories on four national and regional thermal insulation reference materials. The technical note presents thermal conductivity data from JTCCM JTCCM Japan Testing Center for Construction Materials , LNE, NPL, NRC Canada, and NIST for thermal insulation standard reference materials 1451 and 1453, IRMM IRMM Institute of Reference Materials and Measurements IRMM Integrated Removable Media Manager (IBM) 440, and a candidate reference material from Japan. The major finding of the comparison is that there are laboratory-to-laboratory differences for three of the four materials, and that these differences change from material to material. The report provides several recommendations for improving ASTM and ISO (1) See ISO speed. (2) (International Organization for Standardization, Geneva, Switzerland, www.iso.ch) An organization that sets international standards, founded in 1946. The U.S. member body is ANSI. standard test methods for guarded hot plate apparatus. CONTACT: Robert Zarr, (301) 975-6436; robert.zarr@nist.gov. |
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