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ASTM B617 Coin Silver Electrical Contact Alloy

ASTM B617 coin silver is a precious metal alloy formulated for use in electrical contacts. It has a moderately high electrical conductivity among the precious metal electrical contact alloys in the database.

The properties of ASTM B617 coin silver include seven 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 B617 coin 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

75 GPa 11 x 106 psi

Elongation at Break

1.1 to 22 %

Poisson's Ratio


Shear Modulus

28 GPa 4.0 x 106 psi

Shear Strength

180 to 290 MPa 26 to 42 x 103 psi

Tensile Strength: Ultimate (UTS)

290 to 520 MPa 41 to 75 x 103 psi

Thermal Properties

Latent Heat of Fusion

120 J/g

Melting Completion (Liquidus)

870 °C 1600 °F

Melting Onset (Solidus)

780 °C 1430 °F

Specific Heat Capacity

250 J/kg-K 0.060 BTU/lb-°F

Thermal Expansion

19 µm/m-K

Other Material Properties


10 g/cm3 650 lb/ft3

Electrical Conductivity: Equal Volume

83 % IACS

Electrical Conductivity: Equal Weight (Specific)

72 % IACS

Common Calculations

Stiffness to Weight: Axial

4.1 points

Stiffness to Weight: Bending

14 points

Strength to Weight: Axial

7.7 to 14 points

Strength to Weight: Bending

9.3 to 14 points

Thermal Shock Resistance

14 to 25 points

Alloy Composition

Silver (Ag)Ag 89.6 to 91
Copper (Cu)Cu 9.0 to 10.4
Zinc (Zn)Zn 0 to 0.060
Iron (Fe)Fe 0 to 0.050
Cadmium (Cd)Cd 0 to 0.050
Lead (Pb)Pb 0 to 0.030
Phosphorus (P)P 0 to 0.020
Nickel (Ni)Ni 0 to 0.010
Aluminum (Al)Al 0 to 0.0050
Residualsres. 0 to 0.060

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

Followup Questions

Similar Alloys

Further Reading

ASTM B617: Standard Specification for Coin Silver Electrical Contact Alloy