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Commercially Pure Silver

Commercially pure silver is a precious metal alloy formulated for use in electrical contacts. It has a fairly high electrical conductivity and can have the lowest tensile strength among precious metal electrical contact alloys.

The properties of commercially pure silver include six 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 commercially pure 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

1.1 to 29 %

Poisson's Ratio


Shear Modulus

26 GPa 3.8 x 106 psi

Shear Strength

120 to 190 MPa 18 to 28 x 103 psi

Tensile Strength: Ultimate (UTS)

190 to 340 MPa 27 to 49 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


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

4.9 to 8.9 points

Strength to Weight: Bending

6.9 to 10 points

Thermal Diffusivity

170 mm2/s

Thermal Shock Resistance

9.5 to 17 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

Similar Alloys

Further Reading

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