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AWS BVAu-8 (P00927) Vacuum Service Filler Metal

AWS BVAu-8 is a gold-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BVAu-8 is the AWS designation for this material. P00927 is the UNS number.

It has the highest density among gold-based braze fillers. In addition, it has the highest melting temperature and the lowest heat capacity.

The graph bars on the material properties cards below compare AWS BVAu-8 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

1240 to 1270 °C 2260 to 2330 °F

Latent Heat of Fusion

71 J/g

Melting Completion (Liquidus)

1240 °C 2260 °F

Melting Onset (Solidus)

1200 °C 2190 °F

Specific Heat Capacity

140 J/kg-K 0.033 BTU/lb-°F

Thermal Expansion

14 µm/m-K

Other Material Properties


19 g/cm3 1170 lb/ft3

Elastic (Young's, Tensile) Modulus

100 GPa 15 x 106 psi

Poisson's Ratio


Shear Modulus

36 GPa 5.2 x 106 psi

Tensile Strength: Ultimate (UTS)

140 MPa 20 x 103 psi

Common Calculations

Stiffness to Weight: Axial

3.0 points

Stiffness to Weight: Bending

8.3 points

Strength to Weight: Axial

2.1 points

Strength to Weight: Bending

3.2 points

Thermal Shock Resistance

7.1 points

Alloy Composition

Gold (Au)Au 91 to 93
Palladium (Pd)Pd 7.0 to 9.0
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

Similar Alloys

Further Reading

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