... and used correctly.material grade:1700,1800diameter:D1/D2,mm/mmHot zone length:Le,mmCold end length: ... spacing:A,mmexamples:material grade 1800, D1=3mm,D2=6mm,Le=140mm,LU=125mm,A=25mmspecify as : ... ,3/6×140×125×25WShape ,1700,D1=6mm,D2=12mm,Le=300mm,Lu=250mm,A=50mspecify as : ... again the protective film forms.Physical and chemical properties of elements Volume density5.5~5.6kg/cm3Bend strength515~ ...