Investigation of the Parameters Influencing the Refractoriness under Load (RuL) Testing Results for Refractory Materials

E. Dahlem1, A. Stuppfler2

1 Forschungsgemeinschaft Feuerfest e.V., 56203 Höhr-Grenzhausen/Germany
2 ICAR, 54300 Moncel-les-Lunéville/France


Volume 7, Issue 3, Pages 87 - 94


This paper focuses on RuL (Refractoriness under Load) method, and the associated standards which are EN ISO 1893 for shaped materials and EN ISO 1927-6/9 for unshaped materials. The present investigation in RuL testing consists in performing a 2-steps campaign, the first step aiming at determining the relevant factors influencing the data (signal and noise) and the second one aiming at improving the signal values as well as the dispersion of data. The first campaign is performed by one laboratory which carries out an experimental factorial design plan with a comprehensive number of factors. The second campaign involves four different laboratories within a Round Robin Test via a design plan with a reduced number of factors.


refractoriness under load, testing standard, interlaboratory tests


[1] Brochen, E.; Quirmbach, P.; Volckaert, A.: Re-StaR – concerted effort in the European refractory sector to consolidate and made EN testing standards future-proof. refractories WORLDFORUM 7 (2015) [3] 85–86 [2] Goupy, J.: Introduction aux plans d’expérience. Paris 2001 [3] Plackett, R.L.; Burman J.P.: The design of optimum multifactorial. Biometrika 33 (1946) [4] 305–325


Göller Verlag GmbH