Alloy 390E EHT Strip – High-Performance Copper‑Beryllium for Reliable Signal and Power Interconnects

Materion Performance Alloys’ Alloy 390E is a copper beryllium alloy that provides a unique combination of high strength, high electrical conductivity, and excellent formability. Copper beryllium alloys are well known for their superior stress relaxation resistance and fatigue strength. This blend of properties provides engineers the flexibility to design small form factor signal and power interconnects that can be used in harsh environments.

Properties

General

Property	Temperature	Value
Density	23.0 °C	8.83 g/cm³

Dimension

Property	Value	Comment
Thickness	0.05 - 0.38 mm	thinner gauges maybe available upon request
Width	1.27 - 406.5 mm

Mechanical

Property	Temperature	Value	Comment
Bendability 90°, bw	23.0 °C	1 - 3.5 [-]	depending on the thickness
Bendability 90°, gw	23.0 °C	1 - 3.5 [-]	depending on the thickness
Elastic modulus	23.0 °C	138 GPa
Elongation	23.0 °C	2 %	for strip thicker than 0.10 mm
Fatigue strength	23.0 °C	552 MPa	10⁷ cycles, R=0
Hardness, Vickers	23.0 °C	300 [-]
Tensile strength	23.0 °C	986 MPa
Yield strength Rp0.2	23.0 °C	951 MPa

Thermal

Property	Temperature	Value
Coefficient of thermal expansion	23.0 °C	1.76E-5 1/K
Specific heat capacity	23.0 °C	419 J/(kg·K)
Thermal conductivity	23.0 °C	208 W/(m·K)

Electrical

Property	Value
Specific Electrical conductivity	42 % IACS

Technological properties

Property
Application areas	Excellent material for production sockets, appliance switches, relays, sensors and controls.

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