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1/8-Hard Commercially Pure Silver

1/8-hard silver is commercially pure silver in the 1/8-hard temper. It has the second lowest strength and second highest ductility compared to the other variants of commercially pure silver.

The graph bars on the material properties cards below compare 1/8-hard silver 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

71 GPa 10 x 106 psi

Elongation at Break

17 %

Poisson's Ratio

0.37

Shear Modulus

26 GPa 3.8 x 106 psi

Shear Strength

130 MPa 18 x 103 psi

Tensile Strength: Ultimate (UTS)

200 MPa 30 x 103 psi

Thermal Properties

Latent Heat of Fusion

110 J/g

Melting Completion (Liquidus)

960 °C 1760 °F

Melting Onset (Solidus)

960 °C 1760 °F

Specific Heat Capacity

240 J/kg-K 0.056 BTU/lb-°F

Thermal Conductivity

420 W/m-K 240 BTU/h-ft-°F

Thermal Expansion

20 µm/m-K

Other Material Properties

Density

10 g/cm3 650 lb/ft3

Electrical Conductivity: Equal Volume

100 % IACS

Electrical Conductivity: Equal Weight (Specific)

87 % IACS

Common Calculations

Stiffness to Weight: Axial

3.8 points

Stiffness to Weight: Bending

13 points

Strength to Weight: Axial

5.4 points

Strength to Weight: Bending

7.3 points

Thermal Diffusivity

170 mm2/s

Thermal Shock Resistance

10 points

Alloy Composition

Silver (Ag)Ag 99.9 to 100
Residualsres. 0 to 0.1

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

Followup Questions

Further Reading

ASTM B742: Standard Specification for Fine Silver Electrical Contact Fabricated Material