ASTM B197 Grade C17300 TD04 – High-Performance Copper Alloy for RF & Coaxial Applications

Alloy M25 from Materion Performance Alloys is a free machining, high performance copper alloy. M25’s properties minimize signal distortion in coaxial RF connectors and reduce power loss in circular connectors and contact probes. M25 is available in spooled or coiled wire product forms, and in different tempers to accommodate diverse design requirements. After machining and forming operations, M25 parts can be easily heat treated and plated to obtain maximum mechanical and electrical performance. Applications requiring stability to 175° C or reliable contact force in miniaturized designs specify Alloy M25. In demanding electronic applications, M25 provides performance and reliability superior to any free machining copper alloy.

Properties

General

Property	Temperature	Value
Density	23.0 °C	8.36 - 8.8 g/cm³

Dimension

Property	Value	Comment
Diameter	0.76 - 12.7 mm	Smaller diameter wire may be produced by wire redrawers.

Mechanical

Property	Temperature	Value
Elastic modulus	23.0 °C	120 - 131 GPa
Elongation	23.0 °C	9.2 - 75 %
Tensile strength	23.0 °C	410 - 740 MPa
Yield strength	23.0 °C	600 MPa
Yield strength Rp0.2	23.0 °C	130 - 210 MPa

Thermal

Property	Temperature	Value
Coefficient of thermal expansion	23.0 °C	1.6E-5 - 1.75E-5 1/K
Melting point		870 °C
Specific heat capacity	23.0 °C	410 J/(kg·K)
Thermal conductivity	23.0 °C	105 - 110 W/(m·K)

Electrical

Property	Temperature	Value
Electrical resistivity	23.0 °C	6.2E-6 - 7.8E-6 Ω·m
Specific Electrical conductivity		22 - 28 % IACS

Chemical properties

Property	Value	Comment
Aluminium	0 - 0.2 %
Beryllium	1.8 - 2 %
Cobalt	0.2 %	min. Nickel + Cobalt
Copper	95.5 - 97.8 %	Balance
Iron	0 - 0.6 %	max., Nickel + Cobalt + Iron
Lead	0.2 - 2 %
Nickel	0.2 - 0.6 %	min. Nickel + Cobalt
Other	0 - 0.5 %
Silicon	0 - 0.2 %

Technological properties

Property
Application areas	Coaxial RF connectors and circular connectors and contact probes. This alloy to be fabricated into contacts for electronics, aircraft and automotive applications.
General machinability	60% (vs. free-cutting brass)

AA 1060 H14 Aluminium Grade: Key Standards, Mechanical Properties & Density M25 Copper Alloy – High‑Performance, Free‑Machining Solution for RF Connectors (ASTM B197 Grade C17300)

Metal