Cuprothal® WX

Thermocouple wireDatasheet

Datasheet updated 2021-02-04 13:27 (supersedes all previous editions)

Disclaimer: Recommendations are for guidance only, and the suitability of a material for a specific application can be confirmed only when we know the actual service conditions. Continuous development may necessitate changes in technical data without notice. This datasheet is only valid for materials under the trademark Kanthal^®.

Cuprothal^® WX is an austenitic copper-nickel alloy (CuNi) alloy used for the negative leg of the compensating cable for thermocouples type K. Cuprothal^® WX must be matched with iron to meet the reference standards.

Chemical composition

	Cu %	Ni %	Fe %	Mn %
Nominal composition	Bal.	43.0	2.0	2.0

Mechanical properties

Wire size	Yield strength	Tensile strength	Elongation
Ø	R_p0.2	R_m	A
mm	MPa	MPa	%
0.32	-	550	25

Physical properties

Density g/cm³	8.90
Electrical resistivity at 20°C Ω mm²/m	0.52
Temperature factor of resistivity between 20°C and 100°C 10^-6/K	100

Coefficient of thermal expansion
Temperature °C	Thermal Expansion x 10^-6/K
20 - 100	15

Thermal conductivity
Temperature °C	Thermal conductivity W m^-1 K^-1
20 - 100	21

Melting point °C	1210
Magnetic properties	The material is non-magnetic

Thermoelectric properties

Nominal emf values vs iron
Temperature °C	100	200
mV	4.096	8.139

ITS 90 - Reference junction 0°C