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Karma alloy
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 (-60~300℃). 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(0-100℃)μv/℃
Max using
Temp (℃)
Volume
resistivity(μΩ.m)
PPM value
(×10-6/℃)
Karma
8.1
≤2.5
≤300
1.33±8%(20℃)
≤±30(20℃)