AgCu28 Alloy: Ductile, Spring-Ready, and Ideal for Switches & Soldering

AgCu28, also known as Ag72Cu28 or 72Ag28Cu, is ductile, has good spring properties, is sulfur sensitive, and is non-oxidation resistant. It is machinable, roll-cladable and conditionally separable from the gas phase. Application: AC and DC switches for power and telecommunications at switching currents up to 10 A, occasionally up to 25 A, more rarely at higher currents and as a silver-based vacuum braze alloy for electron tubes (soldering range 780 to 900 °C).

Properties

General

Property	Temperature	Value
Density	20.0 °C	10 g/cm³

Mechanical

Property	Temperature	Value	Comment
Elastic modulus	20.0 °C	100 GPa
Elongation	20.0 °C	20 - 28 %
Hardness, Vickers, 10	20.0 °C	98 - 177 [-]
Poisson's ratio	23.0 °C	0.37 [-]	Typical for Silver
Shear modulus	23.0 °C	30 GPa	Typical for Silver
Tensile strength	20.0 °C	350 MPa

Thermal

Property	Temperature	Value	Comment
Coefficient of thermal expansion	300.0 °C	1.86E-5 1/K
Melting point		962 °C	Typical for Silver
Specific heat capacity	23.0 °C	234 - 251 J/(kg·K)	Typical for Silver
Thermal conductivity	20.0 °C	352 W/(m·K)

Electrical

Property	Temperature	Value
Electrical conductivity	20.0 °C	4.61E+7 S/m
Electrical resistivity	20.0 °C	2.2E-8 Ω·m

Chemical properties

Property	Value
Copper	28 %
Silver	72 %

AgCu20 Soft-Annealed Alloy (+A) – High-Performance Switching Material Gold (Au) – 0% Cold Worked: Pure, Unaltered Metal

Metal