# Half-Hard Commercially Pure Palladium

Half-hard palladium is commercially pure palladium in the half-hard temper. It has the lowest ductility compared to the other variants of commercially pure palladium. The graph bars on the material properties cards below compare half-hard palladium 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

120 *GPa* 18 *x 10 ^{6} psi*

Elongation at Break

1.1 *%*

Knoop Hardness

120

Poisson's Ratio

0.39

Shear Modulus

43 *GPa* 6.3 *x 10 ^{6} psi*

Shear Strength

200 *MPa* 29 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

360 *MPa* 51 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

160 *J/g*

Melting Completion (Liquidus)

1550 *°C* 2830 *°F*

Melting Onset (Solidus)

1550 *°C* 2830 *°F*

Specific Heat Capacity

240 *J/kg-K* 0.057 *BTU/lb-°F*

Thermal Expansion

12 *µm/m-K*

## Other Material Properties

Density

12 *g/cm ^{3}* 750

*lb/ft*

^{3}Electrical Conductivity: Equal Volume

16 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

12 *% IACS*

## Common Calculations

Stiffness to Weight: Axial

5.6 *points*

Stiffness to Weight: Bending

14 *points*

Strength to Weight: Axial

8.2 *points*

Strength to Weight: Bending

9.3 *points*

Thermal Shock Resistance

18 *points*

## Alloy Composition

Pd | 99.8 to 100 | |

res. | 0 to 0.2 |

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

## Followup Questions

## Further Reading

ASTM B683: Standard Specification for Pure Palladium Electrical Contact Material