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Quarter-Hard Commercially Pure Silver

Quarter-hard silver is commercially pure silver in the quarter-hard temper. The graph bars on the material properties cards below compare quarter-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

4.6 %

Poisson's Ratio

0.37

Shear Modulus

26 GPa 3.8 x 106 psi

Shear Strength

130 MPa 19 x 103 psi

Tensile Strength: Ultimate (UTS)

230 MPa 34 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

6.1 points

Strength to Weight: Bending

8.0 points

Thermal Diffusivity

170 mm2/s

Thermal Shock Resistance

12 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