Brass bellows :
Operating temperature -60 ℃ -+100℃
Lowest elasticity , and better solder ability , used as measuring celling in non- corrosive and low-precision instrument .
Stainless teel bellows -194℃ -+400℃
Excellent flexural fatigue strength and corrosion-resistance , better solder ability , used as meauring , sealing and compensating components .
9 types of joints : 1, both ends are external joints WW type
2, both ends are internal joints NN type
3, one end is external joints , the other with bottom WDtype
4, both ends are side cut from the trough QdQd type