Cuprothal® 5

Resistance heating wire and resistance wireDatasheet

Datasheet updated 2021-02-04 13:29 (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^® 5 is a copper-nickel alloy (CuNi alloy) with low resistivity for use at temperatures up to 300°C (570°F).

Cuprothal^® 5 is typically used for low-temperature applications such as heating cables in electric blankets and pillows.

Chemical composition

	Ni %	Cu %
Nominal composition	2.2	Bal.

Mechanical properties

Wire size	Yield strength	Tensile strength	Elongation
Ø	R_p0.2	R_m	A
mm (in)	MPa (ksi)	MPa (ksi)	%
1.00 (0.04)	100 (14.5)	240 (34.8)	30

Physical properties

Density g/cm³ (lb/in³)	8.9 (0.322)
Electrical resistivity at 20°C Ω mm²/m (Ω circ. mil/ft)	0.05 (30.1)

Temperature factor of resistivity
Temperature °C	20	100	200	300
Temperature °F	68	212	392	572
Ct	1.00	1.11	1.25	1.40

Coefficient of thermal expansion
Temperature °C (°F)	Thermal Expansion x10^-6/K (10^-6 /°F)
20 - 100 (68-212)	16.5 (9.2)

Thermal conductivity
Temperature °C (°F)	20 (68)
W m^-1 K^-1 (Btu h^-1ft^-1°F^-1)	130 (75.2)

Specific heat capacity
Temperature °C (°F)	20 (68)
kJ kg^-1 K^-1 (Btu lb^-1 °F^-1)	0.380 (0.09)

Melting point °C (°F)	1090 (1994)
Max continuous operating temperature in air °C (°F)	300 (572)
Magnetic properties	The material is non-magnetic