St171-172-175

St171 High Temperature Activation

•getter is not activated during bakeout
•sealing of glass tube does not consume getter
•getter capacity preserved for tube life

St172 Low Temperature Activation

•a getter acting as an internal minipump  is needed either during tube processing or tube operation
•activates at 450 to 500°C
•getter can be activated by bakeout
•getter serves as in-situ pump during bakeout

St175 Low Temperature Activation - Can withstand air baking

•a getter acting as an internal minipump  is needed either during tube processing or tube operation
•activates around 500°C
•getter can be activated by bakeout
•getter serves as in-situ pump during bakeout
•can withstand air baking at temperatures of up to 400°C without dramatic deterioration of gettering performance
•high capacity for Hydrogen without embrittlement