The Definition and Operating Principle of Bimetals:

Bimetal is bonding by two or more different expansion coefficients metal or alloy, whose shape changes at changing temperature.

1、The active side of the bimetal requests large expansion coefficients, high melting point and similar modulus of elasticity with the passive side. And, there are many choices for the raw material of the active side, such as resisto, nickel-ironmanganese,manganin, pure Nickel, pure iron, brass, bronze,stainless steel, etc. Commonly used are Mn72Cu18Ni10,Ni22Cr3, Ni20Mn6, Ni18Cr11, Ni19Cr2, Ni25Cr8, etc.

2、The passive side of the bimetal usually is the ferro-nickel with low expansion coefficients.In 1896, Guillaume invented the invar which having low expansion coefficients, at the room temperature only about 1.2×10-6/℃. It built up the foundation for the bimetal development. Commonly used are Ni36Fe, Ni39Fe, Ni40Fe,Ni42Fe, Ni45Fe and Ni50Fe.

3、In order to attain different resistivity among the bimetal, we usually put in the lower resistivity metal between the active and passive side to affect the resistivity, such as pure Nickel, pure Copper etc.

Product specifications：

1. Classified by Temperature

1)High Temperature:5J1070

2）Medium Temperature:5J1480,5J1580 

3）Low Temperature:5J20110,5J14140

2. Classified by Heat Reactive:

1）High-sensitive ( Flexivity > 30×10－6 /℃): 5J20110,5J14140

2）Medium- sensitive ( Flexivity is at the range of 15~30×10－6/℃):

5J1306A,5J1309A,5J1411A

5J1320B,5J1325B,5J1430B

 3）Low- sensitive ( Flexivity <15×10 -6/℃): 5J0756

3. Classified by Resistance:

Resistance

1）Low -Resistance series:

2）Medium- Resistance series: 5J1325B,5J1433B

3）High- Resistance series: 5J20110,5J14140

Size：

0.1 ~ 1.2×1~ 200

PS：Strip thickness range：0.1～1.5mm; Strip width range：1.5～115mm。

Strip size Tolerance range:

Thermal bimetallic elements stabilized heat treatment system: