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Work Hardened ASTM B522 Class I Gold-Silver-Platinum Alloy

Work hardened ASTM B522 class I is ASTM B522 class I in the cold worked (strain hardened) condition. The graph bars on the material properties cards below compare work hardened ASTM B522 class I 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

96 GPa 14 x 106 psi

Elongation at Break

1.1 %

Knoop Hardness


Poisson's Ratio


Shear Modulus

34 GPa 5.0 x 106 psi

Shear Strength

280 MPa 40 x 103 psi

Tensile Strength: Ultimate (UTS)

490 MPa 70 x 103 psi

Tensile Strength: Yield (Proof)

210 MPa 30 x 103 psi

Thermal Properties

Latent Heat of Fusion

77 J/g

Melting Completion (Liquidus)

1030 °C 1890 °F

Melting Onset (Solidus)

1030 °C 1880 °F

Specific Heat Capacity

160 J/kg-K 0.037 BTU/lb-°F

Thermal Expansion

15 µm/m-K

Other Material Properties


17 g/cm3 1070 lb/ft3

Electrical Conductivity: Equal Volume

11 % IACS

Electrical Conductivity: Equal Weight (Specific)

5.8 % IACS

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

4.5 MJ/m3

Resilience: Unit (Modulus of Resilience)

230 kJ/m3

Stiffness to Weight: Axial

3.1 points

Stiffness to Weight: Bending

8.9 points

Strength to Weight: Axial

7.8 points

Strength to Weight: Bending

8.0 points

Thermal Shock Resistance

24 points

Alloy Composition

Gold (Au)Au 68 to 70
Silver (Ag)Ag 23.5 to 26.5
Platinum (Pt)Pt 5.0 to 7.0
Residualsres. 0 to 0.35

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

Followup Questions

Further Reading

ASTM B522: Standard Specification for Gold-Silver-Platinum Electrical Contact Alloy