Cuprothal® 30

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^® 30 is a copper-nickel alloy (CuNi alloy) with medium resistivity suitable for use at temperatures up to 400°C (750°F).

Cuprothal^® 30 is typically used for applications such as heating cables, fuses, shunts, resistors and various types of controllers.

Chemical composition

	Ni %	Mn %	Cu %
Nominal composition	21.0	1.5	Bal.

Mechanical properties

Wire size	Yield strength	Tensile strength	Elongation	Hardness
Ø	R_p0.2	R_m	A
mm (in)	MPa (ksi)	MPa (ksi)	%	Hv
1.00 (0.04)	170 (25)	380 (55)	30	110
2.20 (0.09)	160 (23)	360 (52)	32	100

Physical properties

Density g/cm³ (lb/in³)	8.9 (0.322)
Electrical resistivity at 20°C Ω mm²/m (Ω circ. mil/ft)	0.30 (180)

Temperature factor of resistivity
Temperature °C	20	100	200	300	400
Temperature °F	68	212	392	572	752
Ct	1.00	1.02	1.03	1.04	1.06

Coefficient of thermal expansion
Temperature °C (°F)	Thermal Expansion x10^-6/K (10^-6/°F)
20-100 (68-212)	16 (8.9)

Thermal conductivity
Temperature °C (°F)	20 (68)
W m^-1 K^-1(Btu h^-1ft^-1°F^-1)	35 (20.2)

Specific heat capacity
Temperature °C (°F)	20 (68)
kJ kg^-1 K^-1 (Btu lb^-1 °F^-1)	0.370 (0.09)

Melting point °C (°F)	1150 (2102)
Max continuous operating temperature in air °C (°F)	400 (752)
Magnetic properties	The material is non-magnetic