70-Silver 30-Nickel Electrical Contact Alloy
70Ag-30Ni alloy is a precious metal alloy formulated for use in electrical contacts.
The properties of 70Ag-30Ni alloy include four 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 70Ag-30Ni alloy 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
100 GPa 15 x 106 psi
Poisson's Ratio
0.35
Shear Modulus
39 GPa 5.6 x 106 psi
Tensile Strength: Ultimate (UTS)
320 to 530 MPa 46 to 77 x 103 psi
Thermal Properties
Latent Heat of Fusion
170 J/g
Melting Completion (Liquidus)
960 °C 1750 °F
Melting Onset (Solidus)
960 °C 1760 °F
Specific Heat Capacity
300 J/kg-K 0.071 BTU/lb-°F
Thermal Expansion
17 µm/m-K
Other Material Properties
Density
10 g/cm3 620 lb/ft3
Electrical Conductivity: Equal Volume
69 % IACS
Electrical Conductivity: Equal Weight (Specific)
62 % IACS
Common Calculations
Stiffness to Weight: Axial
5.8 points
Stiffness to Weight: Bending
16 points
Strength to Weight: Axial
8.8 to 15 points
Strength to Weight: Bending
10 to 15 points
Thermal Shock Resistance
13 to 21 points
Alloy Composition
| Ag | 69 to 71 | |
| Ni | 28.8 to 31 | |
| res. | 0 to 0.2 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASTM B693: Standard Specification for Silver-Nickel Electrical Contact Materials