Ceramic housing for semiconductor and diode passed ISO 9001 and ISO14001. Export to ... ,0-9 Pam3/sFlatness of copper surface,≤0.005mmParallelism between copper surfaces,≤0.03mmConcentricity between flange and copper,≤0.5mmPull test,≥5KN/cm2Temperature ... )Solder,Ag72Cu28 AlloyGate tube,TU1(OFHC·Cu)or Ni42Fe58 Alloy Copper base for SCR, SR--Ceramic Packages