1.MoSi2 heating element 2.type:U,W,UL,WL,Rod. 3 Dia(mm):3/6,4 ... .2.MoSi2 heating element 1) Main type :U, W ,UL, WL, Rod . Material grade :M1700,M1800,M1900.2) ... different atmospheres Atmosphere Max element temperature XYX super MS 17XYX super MS 18Air1700°c1800°cNitrogen1600°c1700°cArgon Helium1600°c1700°cHydrogen1100 ... Lu,mm(4) Shank Spacing :A, mm 2013 XYX UL type best selling MoSi2 heating element