Evanohm® Disk

Evanohm® Disk is a precision-engineered resistance alloy product composed of approximately 75% nickel, 20% chromium, 2.5% copper, and 2.5% aluminum, designed to maintain exceptional electrical stability over a broad temperature range. It exhibits a very low temperature coefficient of resistance and shows no anomalous increase in specific heat at cryogenic temperatures, unlike other common resistance alloys such as manganin or nichrome. These attributes make it indispensable in industries requiring stable, predictable resistance performance, such as aerospace electronics, metrology, and high-reliability sensor manufacturing. Specific uses include calibration-standard resistors, cryogenic temperature sensors, and precision measurement devices operating under extreme thermal conditions. In research, Evanohm® Disks are integral in experiments demanding stable resistance at low temperatures and insensitivity to magnetic fields, thereby supporting advancements in superconductivity studies and high-accuracy instrumentation. Its proven stability and reproducibility make it a critical material in scientific and industrial precision engineering.

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Tolerance

Properties

Reference & Citations

Health hazard/Hazardous to the ozone layer

Serious health hazard

each

Tolerances

Disc

Thickness	>0.05mm	±10%
Thickness	<0.01mm	±25%
Thickness	0.01mm - 0.05mm	±15%

Material Properties for Alloys

Mechanical Properties

Element	Value
Elongation at break( % )	33
Modulus of elasticity( GPa )	221
Izod impact strength( J m⁻¹ )	42-100
Tensile strength( MPa )	1210

Electrical Properties

Element	Value
Electrical resistivity( µOhmcm )	134
Temperature coefficient( K⁻¹ )	0.00001

Thermal Properties

Element	Value
Maximum use temperature in air( C )	300
Melting point( C )	1340-1390
Specific heat( J K⁻¹ kg⁻¹ )	435@23°C
Thermal conductivity( W m⁻¹ K⁻¹ )	14.6@23°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ )	11.7@20-100°C