Menu (ESC)

AWS BVPd-1 (P03657) Vacuum Service Filler Metal

AWS BVPd-1 is a precious metal alloy formulated for use in electrical contacts. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BVPd-1 is the AWS designation for this material. P03657 is the UNS number.

It has the highest heat capacity and a moderately low tensile strength among precious metal electrical contact alloys.

The graph bars on the material properties cards below compare AWS BVPd-1 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.

Thermal Properties

Brazing Temperature

1240 to 1250 °C 2260 to 2290 °F

Latent Heat of Fusion

200 J/g

Melting Completion (Liquidus)

1240 °C 2260 °F

Melting Onset (Solidus)

1230 °C 2250 °F

Specific Heat Capacity

310 J/kg-K 0.073 BTU/lb-°F

Thermal Expansion

12 µm/m-K

Other Material Properties


11 g/cm3 680 lb/ft3

Elastic (Young's, Tensile) Modulus

150 GPa 22 x 106 psi

Poisson's Ratio


Shear Modulus

56 GPa 8.1 x 106 psi

Tensile Strength: Ultimate (UTS)

240 MPa 35 x 103 psi

Common Calculations

Stiffness to Weight: Axial

7.7 points

Stiffness to Weight: Bending

16 points

Strength to Weight: Axial

6.1 points

Strength to Weight: Bending

7.9 points

Thermal Shock Resistance

9.8 points

Alloy Composition

Palladium (Pd)Pd 64 to 66
Cobalt (Co)Co 33.9 to 36
Nickel (Ni)Ni 0 to 0.060
Carbon (C)C 0 to 0.0050
Phosphorus (P)P 0 to 0.0020
Lead (Pb)Pb 0 to 0.0020
Zinc (Zn)Zn 0 to 0.0010
Cadmium (Cd)Cd 0 to 0.0010

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

Followup Questions

Further Reading

AWS A5.8: Specification for Filler Metals for Brazing and Braze Welding