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 .