 For 2006 , the consumption is given as 28 % for General Electric , 28 % Rolls @-@ Royce plc and 12 % Pratt & Whitney , all for superalloys , whereas the use for catalysts only accounts for 14 % and the remaining applications use 18 % . In 2006 , 77 % of the rhenium consumption in the United States was in alloys . The rising demand for military jet engines and the constant supply made it necessary to develop superalloys with a lower rhenium content . For example , the newer CFM International CFM56 high @-@ pressure turbine ( HPT ) blades will use Rene <unk> with a rhenium content of 1 @.@ 5 % instead of Rene N5 with 3 % . 
