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editQuestion validity of external link to Engelhard MetaMax® because of its commercial nature... --Zuejay 04:24, 6 February 2007 (UTC) There is lot of experimental research on use of Metakaolin as cement replacement in concrete.So, there shall be no doubt about the enhancement in properties of concrete due to use of metakaolin.— Preceding unsigned comment added by 202.163.80.251 (talk • contribs)