Menu (ESC)

ASTM B563 Palladium-Silver-Copper Electrical Contact Alloy

ASTM B563 Pd-Ag-Cu is a precious metal alloy formulated for use in electrical contacts. It can have a moderately high tensile strength and a moderately low electrical conductivity among precious metal electrical contact alloys.

The properties of ASTM B563 Pd-Ag-Cu include three common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare ASTM B563 Pd-Ag-Cu to: precious metal electrical contact alloys (top), all alloys in the same category (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Elastic (Young's, Tensile) Modulus

100 GPa 15 x 106 psi

Elongation at Break

7.0 to 17 %

Knoop Hardness

210 to 350

Poisson's Ratio


Shear Modulus

37 GPa 5.4 x 106 psi

Shear Strength

470 to 690 MPa 68 to 100 x 103 psi

Tensile Strength: Ultimate (UTS)

760 to 1170 MPa 110 to 170 x 103 psi

Thermal Properties

Latent Heat of Fusion

150 J/g

Melting Completion (Liquidus)

1180 °C 2160 °F

Melting Onset (Solidus)

1030 °C 1890 °F

Specific Heat Capacity

260 J/kg-K 0.063 BTU/lb-°F

Thermal Expansion

14 µm/m-K

Other Material Properties


11 g/cm3 690 lb/ft3

Electrical Conductivity: Equal Volume

5.6 to 6.7 % IACS

Electrical Conductivity: Equal Weight (Specific)

4.6 to 5.5 % IACS

Common Calculations

Stiffness to Weight: Axial

5.2 points

Stiffness to Weight: Bending

14 points

Strength to Weight: Axial

19 to 30 points

Strength to Weight: Bending

17 to 22 points

Thermal Shock Resistance

39 to 61 points

Alloy Composition

Palladium (Pd)Pd 43 to 45
Silver (Ag)Ag 37 to 39
Copper (Cu)Cu 15.5 to 16.5
Nickel (Ni)Ni 0.8 to 1.2
Platinum (Pt)Pt 0.8 to 1.2
Residualsres. 0 to 0.4

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ASTM B563: Standard Specification for Palladium-Silver-Copper Electrical Contact Alloy

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015