Nisil

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^®.

Nisil is an austenitic nickel-silicon alloy (NiSi alloy) used for the negative leg of thermocouples type N. It offers higher thermoelectric stability in air above 1000°C (1830°F) and better oxidation resistance than type E, J and K thermocouples.

Nisil alloy can not be exposed to sulphur-containing gases. This thermocouple alloy is the most recent one among the different types covered by the international standards.

Chemical composition

	Ni %	Si %	Mg %
Nominal composition	Bal.	4.3	0.1

Mechanical properties

Wire size	Yield strength	Tensile strength	Elongation
Ø	R_p0.2	R_m	A
mm	MPa	MPa	%
2.00	300	680	33

Physical properties

Density g/cm³	8.585
Electrical resistivity at 20°C Ω mm²/m	0.365
Temperature coefficient of resistance between 20°C and 100°C x 10^-6/K	680

Coefficient of thermal expansion
Temperature °C	Thermal Expansion x 10^-6/K
20 - 100	17

Thermal conductivity
Temperature °C	100
W m^-1 K^-1	27

Melting point °C	1420
Magnetic properties	The material is non-magnetic

Recommended maximum continuous operating temperatures
Wire size Ø	3.26	1.63	1.00	0.50	0.25
Bare wire °C	1100	1010	960	890	800
Protected wire °C	1250	1180	1110	1000	910

Note that the indicated temperatures should be considered as guide values

Thermoelectric properties

Nominal emf values vs Nicrosil
Temp °C		mV
100		2.774
200		5.913
300		9.341
400		12.974
500		16.748
600		20.613
700		24.527
800		28.455
900		32.371
1000		36.256
1100		40.087
1200		43.846
1300		47.513

ITS90- Reference junction 0°C