BrushForm® 158 Strip – Heat‑Treatable Cu–Ni–Sn Alloy for High‑Performance Springs

Materion Brush Performance Alloys’ BrushForm® 158 Strip is a high-performance, heat treatable spinodal copper nickel tin alloy designed to provide optimal formability and strength characteristics in conductive spring applications such as electronic connectors, switches, and sensors. The higher strength tempers provide excellent fatigue and impact performance making them ideal for voice coil motor springs in optical image stabilization systems. BrushForm 158 strip is available in both pre-heat treated (mill hardened) and heat treatable (age hardenable) forms.

Properties

General

Property	Temperature	Value
Density	23.0 °C	9 g/cm³

Dimension

Property	Value	Comment
Thickness	0.04 - 0.5 mm	gauge

Mechanical

Property	Temperature	Value	Comment
Bendability 90°, bw	23.0 °C	0 [-]
Bendability 90°, gw	23.0 °C	0 [-]
Elastic modulus	23.0 °C	128 GPa
Elongation	23.0 °C	22 %	for strip thicker than 0.10 mm
Hardness, Vickers	23.0 °C	190 - 290 [-]
Poisson's ratio	23.0 °C	0.3 [-]
Tensile strength	23.0 °C	655 - 795 MPa
Yield strength Rp0.2	23.0 °C	515 - 655 MPa

Thermal

Property	Temperature	Value
Coefficient of thermal expansion	23.0 °C	1.64E-5 1/K

Electrical

Property	Temperature	Value
Electrical conductivity	23.0 °C	4.00E+6 S/m
Specific Electrical conductivity		7 % IACS

Magnetic

Property	Temperature	Value
Relative magnetic permeability	23.0 °C	1.01 [-]

Chemical properties

Property	Value
Copper	Balance
Nickel	14.5 - 15.5 %
Tin	7.5 - 8.5 %

Technological properties

Property
Application areas	Voice coil motor springs (VCM), Optical image stabilization systems (OIS) & Electromagnetic shielding gaskets.

ToughMet® 3AT Ring AT (C72900) – High‑Strength, Corrosion‑Resistant Copper Alloy BrushForm® 158 Strip TM02 – High-Performance Heat‑Treatable Copper‑Nickel‑Tin Alloy for Conductive Springs

Metal