BrushForm® 158 Strip TM19 (C72900): Premium Spinodal CuNiSn Alloy for VCM Springs

Materion Performance Alloys’ BrushForm® 158 strip is a high-performance, heat treated spinodal copper nickel tin alloy designed to provide optimal photochemical machinability, high yield strength, and increased fatigue life. The TM18 and TM19 tempers provide excellent flatness and stiffness coupled with high resistance to vibration, fatigue and impact loading. This makes them ideal for voice coil motor springs in optical image stabilization systems.

Properties

General

Property	Temperature	Value
Density	23.0 °C	9 g/cm³

Dimension

Property	Value	Comment
Thickness	0.03 - 0.12 mm	gauge

Mechanical

Property	Temperature	Value	Comment
Elastic modulus	23.0 °C	119 - 145 GPa
Elongation	23.0 °C	1.4 %	for strip thicker than 0.10 mm
Hardness, Vickers	23.0 °C	375 [-]
Poisson's ratio	23.0 °C	0.3 [-]
Tensile strength	23.0 °C	1416 MPa
Yield strength Rp0.2	23.0 °C	1375 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
Tin	7.5 - 8.5 %

Technological properties

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

BrushForm® 158 Strip TM18 – High‑Performance Copper‑Nickel‑Tin Alloy for Optical Stabilization Systems BrushForm® 158 Strip TD08 (C72900) – Premium Heat‑Treatable Spinodal Copper‑Nickel‑Tin Alloy

Metal