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After a two years' work on the basis of the "Agreement on a Cooperation in the Field of Reference Materials" between NIST and BAM the first joint certification project of NIST and BAM could be successfully finished in August 2002. The material officially named NIST SRM 1917 / CRM BAM-P127 (pellets of Al2O3 with a diameter of about 1 mm) is a certified nanoporous reference material for mercury porosimetry ("Mercury Porosimetry Standard"). Similar to the BAM materials CRM BAM-PM-120, ?121 and -122, the whole Hg intrusion curve has been certified also for the present reference material. From this a number of advantages for the user result:
· availability of a large number of certified data points in the typical working range of mercury porosimeters (0.1 to 400 MPa)
· therefore the possibility of a wide range assessment of the pressure transducer performance and the volume calibration of the porosimeter
· suitability of this reference material for 200 MPa instruments as well as for 400 MPa instruments
17 laboratories from the USA and 15 laboratories from European countries took part in the interlaboratory comparison. The statistical evaluation (calculation of the mean intrusion curve with uncertainty boundaries) has been carried out at NIST using the Vangel Rukhin algorithm.
In particular, the certified properties are
a) the Hg intrusion curve between 0.1 and 400 MPa
b) the cumulative pore volume curve between 3.7 and 14708 nm
c) the pore volume at selected intrusion pressures (as single values)
as well as the mean and the most frequent pore diameter.
This first joint development and certification of a reference material represents a new way in the collaboration between NIST and BAM, which make to avoid multiple developments at the international scale and therefore to save time, costs and expenses.