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AWS BVAu-7 (P00507) Vacuum Service Filler Metal

AWS BVAu-7 is a gold-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BVAu-7 is the AWS designation for this material. P00507 is the UNS number.

It has a moderately high melting temperature among the gold-based braze fillers in the database.

The graph bars on the material properties cards below compare AWS BVAu-7 to: gold-based braze fillers (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

1120 to 1150 °C 2050 to 2110 °F

Latent Heat of Fusion

140 J/g

Melting Completion (Liquidus)

1120 °C 2050 °F

Melting Onset (Solidus)

1100 °C 2020 °F

Specific Heat Capacity

240 J/kg-K 0.056 BTU/lb-°F

Thermal Expansion

13 µm/m-K

Other Material Properties


15 g/cm3 930 lb/ft3

Elastic (Young's, Tensile) Modulus

130 GPa 18 x 106 psi

Poisson's Ratio


Shear Modulus

45 GPa 6.6 x 106 psi

Tensile Strength: Ultimate (UTS)

200 MPa 29 x 103 psi

Common Calculations

Stiffness to Weight: Axial

4.7 points

Stiffness to Weight: Bending

11 points

Strength to Weight: Axial

3.7 points

Strength to Weight: Bending

5.1 points

Thermal Shock Resistance

8.9 points

Alloy Composition

Gold (Au)Au 49.5 to 50.5
Nickel (Ni)Ni 24.5 to 25.5
Palladium (Pd)Pd 23.9 to 26
Cobalt (Co)Co 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