Karma Wire For Precision Resistors (0.02mm, 0.03mm, 0.04mm...)

Karma Wire For Precision Resistors (0.02mm, 0.03mm, 0.04mm...)
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Karma wire for precision resistors(0.02mm,0.03mm,0.04mm...)

Karma alloy is made up of copper, nickel, Aluminum and Iron as the main components. The resistivity is 2~3 times higher than Manganin. It has lower temperature coefficient of resistance(TCR), lower thermal EMF versus copper, good permanence of resistance for a long period of time and strong anti-oxidation. Its working temperature range is wider than Manganin (-60~300ºC). It is suitable for making fine precision resistance elements and strain foil.                           
 
Chemical Content(%)

Grade C Si Mn P S Ni Al Fe Cr
Karma ≤0.04 ≤0.20 0.5~1.05 ≤0.010 ≤0.010 Bal. 2.7~3.2 2.0~3.0 19.0~21.5

 
Physical Properties

Grade Density(g/cm3) EMF vs
Pt(0-100ºC)μv/ºC
Max using
Temp (ºC)
Volume
resistivity(μΩ.m)
PPM value
(×10-6/ºC)
Karma 8.1 ≤2.5 ≤300 1.33±8%(20ºC) ≤±30(20ºC)


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